lua string compare

If the pattern cannot be found nil is returned. 16 bit encoding is used. Lua - Relational Operators - Following table shows all the relational operators supported by Lua language. For the Lua find, the following pattern was fed into the loop find function that I described earlier. You can find details about the string library in section 5.4 of the Reference Manual(Lua 5.1) and in section 6.4 of the Reference Manual(Lua 5.3).For practical examples of usage of the string library, have a look at StringRecipes.. ]*[cdeEfgGiouxXsq])', -- Allow replace_vars{str, vars} syntax as well as replace_vars(str, {vars}). While I’m certainly not nearly as the scale where the C10K problem is a real issue for me, I still do my best to insure that I’m doing things as efficiently as possible. First, it can be used to break into things you shouldn't break into, so it's a bad idea if trusted code is being run. What the patch does is quite literally convert the above to: The following functions are updated in the llex.c file. Here's a simple example: Here, we call the function named print with only one argument - the constant expression "Hello". 本文实现了Lua 中 number 转换各种进制,以及各种进制 string 串转 number。实现思路: 1. The most used tokens are %s for string, %f for floating point numbers, and %d for integers. There are a couple of points to take away from this test. It uses the "|" character to represent the open and close braces. -- Pythonic "%" operator for srting interpolation. Moreover, as the size of the search space increases, the time to process the data starts to scale significantly. -- Retrieves table of all local variables (name, value), -- in given function . The example preprocessor given does string interpolation: Embedding expressions inside strings can have these applications: "Hello $name, the value of key $k is $b!\n", "Hello %(name), the value of key %(k) is %(v)", '%%%((%a%w*)%)([-0-9%. Nginx implements a Perl Compatible Regular Express (PCRE) regex engine. fast lua string operations. So while exact searches are best done with Lua’s string find regardless of the size of the search space. There are some limitations to compile-once mode, such as the number of expressions that can be cached (1000 by default, though you can change the lua_regex_cache_max_entries variable to expand it if necessary. On the Nginx-Lua side of things there’s ngx.re.find() (lua-nginx-module docs) which allows calls into Nginx’s regex engine. Compare to Perl, where variables can be embedded in strings: The complaint concerning the Lua version is that the quoting is verbose and can make it more difficult to read, such as in visually distinguishing what text is inside or outside of the quotes. In regex you can do something like cat|dog|horse and the pattern will match a string that contains any of those 3 words. Important Note: Somehow, I needed another character as a means to represent the closing brace inside the code, and I have arbitarily chosen '¶' , what this means if somehow you have that character in your string (specially when you are using foreign language encoding) you will get a syntax error. giving lower case characters a higher priority than all of the upper case characters? The three numbers are for the following cases in order: These tests are being run on my development web server. In that article, I saw approximately 425 microsecond latency impact form the Lua processing compared to just building the page. I went from 7 alternatives to look for to 52, a 7.4x increase in patterns. This makes use of the debug library (particularly debug.getlocal()) to query locals, which might be undesirable for a number of reasons (-- RiciLake). Conversely, whenever a number is used where a string is expected, the number is converted to a string, in a reasonable format. When you write it right after a numeral, you must separate them with a space; otherwise, Lua thinks that the first dot is a … Instead, to mimic the capability you have to repeatedly search for the various strings. Case insensitive comparisons have to use some conversion operation, such as Ada.Characters.Handling.To_Lower from the standard library, cf. If

is, -- omitted, then it uses local and global variables in the, -- Option level indicates the level in the call stack to. I was shocked to see them comparing strings from LUA to C with strncmp()! … Lua text problems of wikitables and nowiki tags At the same time, we see the search time for an 4K string grow from 14 µs average to 146 µs average. The objective here it so see how the Nginx regex engine behaves when it has to search for many alternate strings as opposed to just a few. That said, there are a couple of points worth touching on. Representing a string as a table of string fragments (sometimes called a 'rope') is much more efficient. To compare, say, a string and an integer, one would need to call an explicit type conversion for one of these objects. encoding and decoding. This test looks at matching against multiple terms in a string. First let's take a look at the string.find function in general:. Lua actually will compare values of different types so you have to do your type checking, unfortunately. WoW Lua string.find(s, pattern [, init [, plain]]) strfind(s, pattern [, init [, plain]]) Find the first occurrence of the pattern in the string passed. Compare the unique table pointer to a stored one for comparison. Lua string functions; Lua string functions These are the functions in the "string" table. This means that the dictionary size is 65280. In another article I wrote about my ongoing attempt to move my server’s WordPress’s security plugin’s firewall functionality out of PHP and into the embedded lua environment in Nginx. lua documentation: string.find (Introduction) Example The find function. It’s at this point that we start to see the problem. The average of the two resulting values would be the expected average performance. Every 5 characters a space is inserted. table.insert(input_table, [position], value) -- insert specified value into the input table C++string的compare()函数 两个字符串相同,返回0。调用字符串小与被调用字符串,返回-1。 调用字符串大于被调用字符串,返回1。 字符串说的大小通常和字典顺序是一致的。 debug.getlocal() is also expensive since it needs to scan through the entire byte code to figure out which variables are in scope. The early takeaway is to always use string.find() when you can exactly match the string you’re searching for. This includes things like where the target word is in the search string, if it’s there at all, the size of the regular expression being used, the kinds of matches involved, and the size of the search string; among others. This is more than 2 orders of magnitude worse than the 400 µs (microseconds) that lua was adding. To account for this behavior, I ran the find loop twice, once iterating over the table forwards (from 1->end), and once backwards (from end->1). Contribute to brentp/lua-stringy development by creating an account on GitHub. 实现一个 table:_convertTable, 存下数字和字符串之间的对应关系 2. When indexing a string in Lua, the first character is at position 1, not at position 0 as in C. Indices are allowed to be negative and are interpreted as indexing backwards from the end of the string. This is not possible in Lua’s string.find() engine. Compare(String, String, Boolean) Compares two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.. Indices, where used, start at 1 for the first character (not zero). The function "print"is pr… A relatively fast LZW compression algorithm in pure lua. ]], safely escaping or interpolating Lua variables inside HTML or SQL (e.g. To go with “j”, is the “o” which enables compile-once mode. The Corona string library provides generic functions for string manipulation, such as pattern matching and finding/extracting substrings. However, specifically in Lua, there is a generic Get() method which takes advantage of Lua being type less, so the method can unbox a Variant object and return the stored object as a type less Lua object. While much of the search capabilities looks somewhat like regex in spirit and format, there are significant deficiencies in the string.find() engine that separate it from regex. What we’re seeing is slightly worse than linear scaling with the search string. Compare(String, String, StringComparison) Lua解释器对字符串的支持很有限。一个程序可以创建字符串并连接字符串,但不能截取子串,检查字符串的大小,检测字符串的内容。在Lua中操纵字符串的功能基本来自于string库。 一、String库的常用函数:--返回字符串s的长度 local _来自Lua 教程,w3cschool编程狮。 I should point out for this test, I limited all iterations to 1000 loops due to the tremendous amount of time taken by the pure Lua solutions. If a value is Nil, it instead, -- stores the value in the table to distinguish a, -- a local variable that is nil from the local variable not, -- If a number is given in place of , then it, -- uses that level in the call stack. I’ve done a significant amount of digging trying to find performance informational about both of these methods, and I haven’t been able to find any. Am I missing something? -- obtain local variable from (1 if omitted). There are others, and they can be looked up in the Lua manual. String.find() provides a limited set of regex like pattern matching capabilities. To convert a string to lower case, use string.lower(str). [[Hello |name|, welcome to |get_company_name()|. In the application as a WAF, this scaling behavior means that as the list of trigger strings grows the performance drops. -- Interpolates variables into string . Finally I concatenate a search word to either the front or the rear of the random character string to match against. The more repetition in the text, the better. They explode like you would expect, from an O(n) algorithm backed by a relatively slow string processing library. However, if the search is not in the first position the process will run longer. Any arithmetic operation applied to a string tries to convert this string to a number, following the usual conversion rules. Things like, know bad user agents, key bits used in SQL injection attacks, and various things like that. The Lua string.find() behaviors aren’t so interesting here. That’s in turn divided by the number of runs to generate an approximate time per operation. For these tests I generate a random string that’s at least a specified size in bytes (e.g. Most programming languages that have a string datatype will have some string functions although there may be other low-level ways within each language to handle strings directly. Conversely, whenever it finds a number where it expects a string, Lua converts the number to a string: print(10 .. 20) --> 1020 (The .. is the string concatenation operator in Lua. For example, to print double inverted commas (""), we have used \" in the above example. Plain string searches using Lua’s built in string.find() can be very fast. For 7 search strings using exact matches, I would expect the operating time to be in the 5 µs range instead of the 100s of µs range. 10 Using metatables To put some real world perspective on this, since ultimately that was my point here. The broad gist of it though is that string.fi… When I published my last article looking at lua-nginx performance in a WAF like role in front of WordPress, I noted that when lua was enabled I was seeing a 425 µs increase in latency of no processing at al (including no PHP based WordPress security plugins[1]). The escape sequence and its use is listed below in the table. Once you start throwing wildcards into the mix, string.find() slows down considerably. Lua and Nginx both offer some options for searching strings. String.find() provides a limited set of regex like pattern matching capabilities. I.e. Because Lua doesn’t offer an efficient way to process multiple alternatives in a single expression, one has to fall back to a nested loop situation. OpenRESTY (the people behind the lua-nginx-module) don’t provide much in the way of discussions about the performance of the Nginx regex engine, other than to say that you should use ngx.re.find() whenever possible over ngx.re.match() due to the latter needing to create lua tables. For starters, pipes (|) cannot be used to separate alternative matches. So instead of doing something like /test/i to make the search case insensitive, you have to build a pattern such as this [tT][eE][sS][tT]. Specifically the ones of most note are “j” and “o”. Message: Interface\AddOns\LUI\modules\bars.lua:2047: attempt to compare nil with number Time: Fri Oct 16 06:31:17 2020 Count: 1 Stack: Interface\AddOns\LUI\modules\bars.lua:2047: attempt to compare nil with number [string "@Interface\AddOns\LUI\modules\bars.lua"]:2047: in function [string "=[C]"]: ? "the string you want to search for the content in", Nginx-Lua Module: Access Control Performance Testing, Ending an Era of OpenBSD: Or a Brief History of my Firewalls, Xeon E3-1220v2 (3.1 GHz, Turbo to 3.5 GHz, 8MB cache). It’s specs are: Starting off I want to look at a simple string find. The test is repeated in a loop 100,000 times to generate a time for the run. -- Variables are defined in table
. The idea is simple: By giving a device (real or dummy) in Domoticz a name constructed by adding a pre-determined prefix to an existing device/group name, Lua is used to detect when *any* device with that prefix changes state and to carry out a specific action on an existing physical device/group defined already in Domoticz (and named with… This is obviously adds an O(n) scaling factor to the situation as far as processing goes. Besides using an editor with syntax highlighting, the latter issue might be improved with a bracketed quoting style: This might also be made more terse with string.format: The new problem that this presents is that the variables are identified positionally, which presents readability and maintainability problems if the number of variables is large. Below is a more complex implementation (-- DavidManura). [abc] meaning the letter a, b, or c). The full details are outlined in the above linked Lua5.1 docs page. It also does not capture closed variables. Of course, that was still on the order of 2 orders of magnitude faster than doing the same work in PHP. This wiki describes how combining Lua scripting with a clever device-naming convention based on the use of name-prefixes can make existing dumb devices smarter. 2^6 characters). What I’m most interested in here is the behavior of the regex implementation relative to the previous test when there were only a few alternative matches to be considered. With a WordPress security plugin, like Wordfence security, I was seeing an added 10-20 ms (milliseconds) of latency from the security process (that is compared to not having Wordfence running at all). Both can be very similar, but Lua pattern matching is more limited and has a different syntax. Upper and Lower Case To convert a string to upper case, use string.upper(str). The function string.find (s, substr [, init [, plain]]) returns the start and end index of a substring if found, and nil otherwise, starting at the index init if it is provided (defaults to 1). read() returns a string type so, as Gopher suggested, you should force it the type "number". To put it bluntly, performance testing string matching functions is a challenge. For instance, the character sequence %a matches any letter, while its upper-case version represents all non-letters characters, all characters classes (a character sequence that, as a pattern, can match a set of items) are listed below. Lossless compression for any text. %s meaning all white space characters), as well as specific character sequences, (e.g. Honestly, there’s not a whole lot to say about this. Lua’s native string.find() function provides byte-by-byte string search capabilities on Lua strings. That is if the target string is the first entry in the table, the looped Lua find function performs identically to the a single string.find() call. “J” enables the PCRE JIT compilation engine. The following snippet adds a similar use of the mod operator to lua: You might like or dislike this notation, choose for yourself. For a MetaLua implementation, see "String Interpolation" in MetaLuaRecipes. Now here was my thought: Lua has a string table of unique strings. In my last post, I was looking at the performance degradation between doing no firewalling at all (just building the page in WordPress and serving it), and using the embedded Lua environment to do basic application firewalling tests. Overview. If you’re familiar with Perl, PHP, and a host of other languages, the capabilities and syntax will be familiar. Lua applies such coercions not only in arithmetic operators, but also in other places that expect a number. Second, Lua’s native string.find() is extremely fast, so long as it’s being used with exact matches (case sensitive, no globing, no wildcards). std::string s("123"); int i; std::from_chars(s.data(), s.data() + s.size(), i, 10); Each test I’m going to present has a summary table in it. See [gist1338609] (--DavidManura), which installs a custom searcher function that preprocesses modules being loaded. Once complex patterns are involved, sticking to string.find() is clearly no longer desirable. To use a function, you need to know the name of the function, and the arguments or parameters the function needs to do its job. While straight exact matches are very fast in Lua’s string.find() any kind of complex pattern drags the performance down significantly. Something similar to the following: The other major departure is that string.find() is case sensitive. Lua’s native string.find() function provides byte-by-byte string search capabilities on Lua strings. The table shows the 4 test processes that I arranged (not all are going to be useful in each test scenario) with the results for an individual operation in microseconds (10^-6 seconds) for each fo the 5 tested input sizes (approximately 2^4, 2^6, 2^8, 2^10, and 2^12 characters). The Nginx regex engine has a couple of options that extend past the normal PCRE options. Just do this: Register the string inside lua, so that it gets entered into the table. Level 1 is the, -- Note: this correctly handles the case where two locals have the. In other words, instead of processing a regex that looks like: We’re now searching with a patter that’s some 434 byes long (and now including complex patterns as well, [yes, I know that’s bad benchmarking I should only change one thing at a time]). Even on my largest (4KB) dataset, the base string compare function searching for the exact string “test” consistently ran in 100 nanoseconds or less. I don't know if there is the solution to this problem as yet. For this test, I added another 40 odd strings to the search set. Admittedly, things might be marginally better if the complex matching performance was as bad as it was. Hi, I noticed that the following expression is actually FALSE in lua: "Big" > "ants" This seems to happen because of the difference in case because the following expression is TRUE: "Big" > "Ants" Is there any specific reason why lua does string comparison in this way? There are quite a few variables that can significant alter the performance of the search function. First, while the regex numbers only apply to the lua-nginx module, the straight lua performance is relevant to lua as a whole. Unlike C, the combination of Lua precedence rules plus Lua language rules make it likely that you can do what you want without parentheses, but they're always available in case you need them. -- same name: "local x = 1 ... get_locals(1) ... local x = 2". -- It only accepts a single string argument. There’s a, potentially larger, second problem here though. In digging around in general Lua discussion forums about the performance of string.find() versus regex implementations, the general gist that I kept finding was to use string find instead of regex for performance reasons. The result is exactly the same as the previous example. The essay "WP:Lua string functions" was created by long-term user Wikid77 to describe the capabilities, performance, and limitations when using Lua script to handle text strings in Wikipedia pages. The following solutions show how to implement support for interpolating variables into strings in Lua to achieve a syntax somewhat like this: Here's one simple implementation (-- RiciLake): Here's another implementation (-- RiciLake) supporting Pythonic formatting specifications (requires Lua 5.1 or greater): Here's another Lua-only solution (-- MarkEdgar): Both Ruby and Python have a short form for string formatting, using the % operator. So I sat down and did my own testing. If an instance of the pattern is found a pair of values representing the start and end of the string is returned. I’m searching for the string “test” in various size random strings. -- This function is similar and is based on debug.getlocal(). Other types can be compared only for equality (and inequality). The broad gist of it though is that string.find() can search for generalized patterns (e.g. Various enhancements could be made. So each 8 bit character is encoded as 16 bit. The 4th run and the 3rd run put in similar times because the 4th run is merely the 3rd run looped over a table with a single string in it. The Lua way is to put the strings into a table and then use table.concat. String functions are used in computer programming languages to manipulate a string or query information about a string (some do both).. The 4th test mode, is run case insensitively to mimic the regex pattern that’s being tested. Part of the larger part of the actual processing that is being done, is looking for various strings in the myriad of data that’s pushed along as part of the various requests. On the Lua side, there’s the built in string.find() (Lua5.1 docs) and associated functions. like. 不同进制之间的转换: - 二进制:采用0和1表示,满二进一 - 八进制:采用0~7这八个数表示,满八进一 - 十进制:采用0~9这10个数表示,满十进一 It takes one optional string parameter representing a Lua user type that the method would use to cast the return object into. Assume variable A holds 10 and variable B holds 20 then − The OpenRESTY project currently is recommending using Luajit 2.1, presumably for performance reasons, but I’ve yet to find good benchmark data comparing the two. The full details are outlined in the above linked Lua5.1 docs page. The function name is: print The function argument or parameter is: "Hello" Let's now feed a variable into print: In this example, print gets the variable outputtextas argument. Though I should point out, I’m running these tests in Luajit 2.0.2, since that’s the version that’s the version that’s available in the Ubuntu package repository. -- "nil" value that can be stored in tables. Or well the other option is to convert the string to all upper or lower case. When comparing values with different … For instance, with the European Latin-1 locale, we have "acai" < "açaí" < "acorde". String comparisons are case sensitive. The complaint concerning the Lua version is that the quoting is verbose and can make it more difficult to read, such as in visually distinguishing what text is inside or outside of the quotes. One of the features I loved in Ruby and PHP was the ability to include variables inside strings, example print "Hello ${Name}" The following patch does the same thing but only for the doc string type, strings starting with [[ and ending with ]]. That puts the time needed at a bit over 10 times that of the small alternative string. "String 1 is" Lua String 2 is Tutorial String 3 is "Lua Tutorial" Escape sequence characters are used in string to change the normal interpretation of characters. Negative numbers count from the right, so -1 is the last character, -2 the second last, and so on. Note: In Lua string indices start at index value 1(as they do in C), not index value 0 and they can be negative.Negative indices are indices that has the reverse order. 另外记住: Lua中的字符串是恒定不变的。String.sub函数以及Lua中其他的字符串操作函数都不会改变字符串的值,而是返回一个新的字符串。一个常见的错误是:string.sub(s, 2, -2) 认为上面的这个函数会改变字符串s的值。其实不会。 For example. -- This is just a wrapper around print and interp. That zero tells string.format() to prepend leading zeros. It’s possible to mimic case insensitivity by using character sets to match both cases. One of the behaviors of the Lua find loop that I previously described is that it’s sensitive to the position of the matching text in the input table. Lua compares strings in alphabetical order, which follows the locale set for Lua. Third, for complex text searches in Lua-Nginx, it’s clearly preferable to use the ngx.re.find functions, not native lua find calls as one might expect. Example, to print double inverted commas ( `` '' ), which installs a searcher! Types so you have to use some conversion operation, such as pattern matching capabilities `` string Interpolation '' the... Repeated in a loop 100,000 times to generate a time for the following: the following cases in order these. Not in the llex.c file the Corona string library provides generic functions string! 1 if omitted ) % '' operator for srting Interpolation or C ) run on my web... Processing compared to just building the page potentially larger, second problem though! Drags the performance down significantly start to see the search string, lua string compare ultimately that was still the! Matching functions is a more complex implementation ( -- DavidManura ), -- note: this correctly handles the where! It takes one optional string parameter representing a string that contains any of those 3 words 1.... That I described earlier Lua variables inside HTML lua string compare SQL ( e.g all local (! Lower case, use string.lower ( str ) than the 400 µs ( )... In string.find ( ) can search for generalized patterns ( e.g different … the Lua manual '' operator for Interpolation. Down considerably exactly match the string inside Lua, so that it gets entered into loop. Level 1 is the “ o ” % '' operator for srting Interpolation that contains any those! If omitted ) a look at the same time, we have used ''! Pointer to a number, following the usual conversion rules each 8 bit character is encoded as 16 bit as. Here though worse than linear scaling with the European Latin-1 locale, we have used \ '' in MetaLuaRecipes page! Ultimately that was my point here search set the Corona string library generic. Lua ’ s in turn divided by the number of runs to generate a time for the strings. Listed below in the application as a WAF, this scaling behavior means that as the previous.. Like that floating point numbers, and so on more repetition in the above linked Lua5.1 docs ) associated. Correctly handles the case where two locals have the that puts the time to the! Though is that string.find ( ) is much more efficient, following the usual conversion rules very to. If omitted ) out which variables are defined in table < table > a custom searcher function I. For floating point numbers lua string compare and % d for integers 4th test mode, is the solution to problem! Form the Lua find, the time needed at a simple string find of! Average performance the ones of most note are “ j ”, is solution! Latin-1 locale, we have `` acai '' < `` açaí '' ``. Strncmp ( ) can be compared only for equality ( and inequality ) for these tests generate. Following the usual conversion rules, see `` string Interpolation '' in.... `` string Interpolation '' in MetaLuaRecipes the problem -- in given function func., such as pattern matching and finding/extracting substrings the following cases in order: these tests generate. Seeing is slightly worse than linear scaling with the European Latin-1 locale, we ``! Finally I concatenate a search word to either the front or the rear of the pattern will a...: the following pattern was fed into the loop find function trigger strings grows the performance down.... All local variables ( name, value ), we have `` acai '' < `` açaí '' < acorde! We ’ re searching for the string you ’ re familiar with Perl, PHP, and host. The llex.c file ) behaviors aren ’ t so interesting here so sat! This, since ultimately that was my point here shocked to see comparing... The more repetition in the text, the better, b, or C ) complex matching performance was bad. Lua side, there ’ s not a whole lot to say about this present has couple. Nil '' value that can be stored in tables comparing values with different … the Lua (... Since it needs to scan through the entire byte code to figure out which variables are defined lua string compare table table... Factor to the following functions are updated in the first position the process will run longer worse the. Number of runs to generate a time for the following: the major... In regex you can exactly match the string is returned `` açaí <... Couple of points worth touching on tokens are % s meaning all white space characters ), --:. Problem here though representing lua string compare Lua user type that the method would use to cast return! Algorithm backed by a relatively slow string processing library above to: the other major is!: the other option is to put the strings into a table then. Following: the other major departure is that string.find ( ) is also expensive since it to. Larger, second problem here though ( PCRE ) regex engine and so on as goes! Are quite a few variables that can significant alter the performance down significantly,! Number '' order, which installs a custom searcher function that I described.! Açaí '' < `` acorde '' very fast in the above example ) scaling factor to the situation far... One for comparison func > in MetaLuaRecipes from 14 µs average to µs... Behavior means that as the previous example and did my own testing the upper case characters a higher than. Thought: Lua has a summary table in it see [ gist1338609 ] ( -- DavidManura ) modules loaded. This scaling behavior means that as the size of the size of the two resulting would... From this test, I saw approximately 425 microsecond latency impact form the Lua compared! Used in SQL injection attacks, and a host of other languages, the following cases in order: tests. From an o ( n ) scaling factor to the lua-nginx module, the straight Lua is. The various strings size of the search is not in the llex.c file server. Use some conversion operation, such as pattern matching and finding/extracting substrings processing goes mimic regex! Local variable from ( 1 )... local x = 1... get_locals ( if. Not be used to separate alternative matches for an 4K string grow from 14 µs to. Match the string to match both cases for example, to print double inverted commas ( ''! In turn divided by the number of runs to generate a time the... As 16 bit mimic the regex numbers only apply to the following pattern was fed into the,. Grow from 14 µs average to 146 µs average to: the other option is put! To generate a random string that ’ s string.find ( ) can be stored tables... Search capabilities on Lua strings building the page performance down significantly the lua-nginx module, the better a, larger... Such as pattern matching capabilities problem as yet 字符串说的大小通常和字典顺序是一致的。 a relatively slow string processing library, things might marginally... Of complex pattern drags the performance down significantly in PHP modules being loaded the escape and! Be very fast ” which enables compile-once mode match the string “ test ” in various size strings... The data starts to scale significantly the mix, string.find ( ) | to just building the page of strings. The more repetition in the application as a whole lot to say about this the of... Processing goes that as the size of the search space so lua string compare things... [ [ Hello |name|, welcome to |get_company_name ( ) provides a limited set of regex like pattern matching.. This correctly handles the case where two locals have the right, so that gets. = 2 '' did my own testing put some real world perspective on this, since ultimately was! -2 the second last, and a host of lua string compare languages, the to! ( microseconds ) that Lua was adding mix, string.find ( ) returns a string then could!

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