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| {{CatUp|Function Dump}} | | {{User:Merlin11188/Templates/NoEdit}} |
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| ==String Manipulation==
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| This library provides generic functions for string manipulation, such as finding and extracting substrings, and pattern matching. When indexing a string in Lua, the first character is at position 1 (not at 0, as in C). Indices are allowed to be negative and are interpreted as indexing backwards, from the end of the string. Thus, the last character is at position -1, and so on.
| | {{Stub}} |
| | {| |
| | |[[File:Home_Subpage.png|frame|A picture of the 'Home' tab on the submenu in 'My ROBLOX'.]] <br/> |
| | |} |
| | __TOC__ |
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| The string library provides all its functions inside the table string. It also sets a metatable for strings where the __index field points to the string table. Therefore, you can use the string functions in object-oriented style. For instance, string.byte(s, i) can be written as s:byte(i). Parameters written in brackets are optional.
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| | ===Character and Notifications=== |
| | {| |
| | |On the far left of the page there is a picture of [[My_Character|your character]]. Underneath, there is a link to your system notifications. |
| | |[[File:Avatar_Notifications.png|frame|A picture of [[My_Character|your character]] with system notifications beneath it.]] |
| | |} |
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| ===string.byte (s [, i [, j]])=== | | ===Best Friends=== |
| | {| |
| | |Underneath of your avatar and notification box is your [[Friends#Best_Friends|best friends]] list. Here you can see what your best friends are doing (from their [[My_Home#Status_Update|shout box]]) and whether or not they're online. |
| | |[[File:Best_Friends.png|frame|This a list of your [[Friends#Best_Friends|best friends]] and their most recent shouts!]] |
| | |} |
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| | ===Status Update=== |
| | {| |
| | |You can use this so that people who visit your profile can see what you're up to. |
| | |[[File:Status Update.png|frame|This is the status update bar. People who have you as their [[Friends#Best_Friends|best friend]] will see it on their [[My_Home|home]]!]] |
| | |} |
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| Returns [http://wiki.roblox.com/index.php/Image:Ascii_Table.png ascii values] of the characters s[i], s[i+1], all the way until s[j]. The default value for i is 1; the default value for j is i.
| | ===Feed=== |
| | {| |
| | |Your feed is in the center of the page, just beneath your status update box. Your feed is a way to keep you updated with all of your groups. Every time someone uses the shout box in one of your [[groups]], you're updated here! |
| | |[[File:Feed bar.png|frame|This is for your feed—all of your [[groups]]' shouts go here.]] |
| | |} |
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| Note that numerical codes are not necessarily portable across platforms.
| | ===Recently Played Games=== |
| | {| |
| | |On the far right is the 'Recently Played Games' box. Your most recently played games can be seen here. If you want a larger list, you can click the '''See More''' button. |
| | |[[File:Recently_Played_Games.png|frame|This is a list of your most recently played [[game]]s.]] |
| | |} |
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| {{Example| | | ===Facebook Connect=== |
| <pre>
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| print(string.byte ("abc", 1, 3))
| | |On the far right, underneath of the 'Recently Played Games' box is the Facebook connect box. If you have a Facebook account, you can link it to your ROBLOX account! See [[connecting your account to Facebook]] for more info. |
| | |[[File:FacebookConnect_Unconnected.png|frame|Facebook connect. You can use this to link your Facebook account to your [[Roblox|ROBLOX]] account! Your personal info will '''not''' be shared with other users!]] |
| | |} |
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| Will result in:
| | <!-- |
| 97 98 99
| | {| class="wikitable" style="border-spacing: 0px; padding: 0px;" |
| </pre> | | |- |
| }}
| | |[[File:Avatar + Notifications]] |
| | | |[[File:Status_Update.png]] |
| ===string.char (···)===
| | |[[File:Recently_Played_Games.png|287px]] |
| | | |- |
| | | |[[File:Best_Friends.png]] |
| Receives zero or more integers. Returns a string with length equal to the number of arguments, in which each character is the [http://wiki.roblox.com/index.php/Image:Ascii_Table.png ascii representation] equal to its corresponding number.
| | |<div style="top:0px;">[[File:Feed_bar.png]]</div> |
| | | |[[File:FacebookConnect_Unconnected.png]] |
| Note that numerical codes are not necessarily portable across platforms.
| | |}--> |
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| {{Example| | |
| <pre>
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| print(string.char (97, 98, 99, 100))
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| Will result in:
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| abcd
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| </pre>
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| }}
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| ===string.dump (function)===
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| Returns a string containing a binary representation of the given function, so that a later loadstring on this string returns a copy of the function. function must be a Lua function without upvalues. This function is commonly used in [[Script Obfuscation|script obfuscation]].
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| {{Example|
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| <pre>
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| function f ()
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| print "hello, world"
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| end
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| s = string.dump (f)
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| assert (loadstring (s)) ()
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| Will result in:
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| hello, world [http://www.gammon.com.au/scripts/doc.php?lua=string.dump]
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| </pre>
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| }}
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| ===string.find (s, [[Patterns|pattern]] [, init [, plain]])===
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| Looks for the first match of [[Patterns|pattern]] in the string s. If it finds a match, then find returns the locations of s where this occurrence starts and ends; otherwise, it returns nil. A third, optional numerical argument, init, specifies where to start the search; its default value is 1 and may be negative. A value of true as a fourth, optional argument, plain, turns off the pattern matching facilities, so the function does a plain "find substring" operation, with no characters in pattern being considered "magic" (see [[Patterns|patterns]]). Note that if plain is given, then init must be given as well.
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| If the pattern has captures, then in a successful match the captured values are also returned, after the two indices.
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| {{Example|
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| <pre>
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| print(string.find ("blahblah", "bla"))
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| Will result in:
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| 1 3
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| </pre>
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| }}
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| ===string.format (formatstring, ···)===
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| Returns a formatted version of its variable number of arguments following the description given in its first argument (which must be a string). The format string follows the same rules as the printf family of standard C functions. The only differences are that the options/modifiers *, l, L, n, p, and h are not supported and that there is an extra option, q. The q option formats a string in a form suitable to be safely read back by the Lua interpreter: the string is written between double quotes, and all double quotes, newlines, embedded zeros, and backslashes in the string are correctly escaped when written. For instance, the call
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| string.format('%q', 'a string with "quotes" and \n new line')
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| will produce the string:
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| "a string with \"quotes\" and \
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| new line"
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| The options c, d, E, e, f, g, G, i, o, u, X, and x all expect a number as argument, whereas q and s expect a string.
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| This function does not accept string values containing embedded zeros, except as arguments to the q option.
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| {{Example|
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| <pre>
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| print (string.format ("To wield the %s you need to be level %i", "sword", 10))
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| Will result in:
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| To wield the sword you need to be level 10
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| </pre>
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| }}
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| ===string.len (s)===
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| Receives a string and returns its length. The empty string "" has length 0. Embedded zeros are counted, so "a\000bc\000" has length 5.
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| {{Example|
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| <pre>
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| print(string.len (""))
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| print(string.len ("a"))
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| print(string.len ("ab"))
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| print(string.len ("abc"))
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| Will result in:
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| 0
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| 1
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| 2
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| 3
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| </pre>
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| }}
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| ===string.lower (s)===
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| Receives a string and returns a copy of this string with all uppercase letters changed to lowercase. All other characters are left unchanged. The definition of what an uppercase letter is depends on the current locale.
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| {{Example|
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| <pre>
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| print(string.lower ("Hi Mom!"))
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| Will result in:
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| hi mom!
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| </pre>
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| }}
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| ===string.match (s, pattern [, init])===
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| Looks for the first match of pattern in the string s. If it finds one, then match returns the captures from the pattern; otherwise it returns nil. If pattern specifies no captures, then the whole match is returned. A third, optional numerical argument init specifies where to start the search; its default value is 1 and may be negative.
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| {{Example|
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| <pre> | |
| print (string.match ("I like pepperoni pizza", "pi..."))
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| Will result in:
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| pizza
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| </pre>
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| }}
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| ===string.rep (s, n)===
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| Returns a string that is the concatenation of n copies of the string s.
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| {{Example|
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| <pre>
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| a=string.rep ("blah", 4)
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| print(a)
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| Will result in:
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| blahblahblahblah
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| </pre>
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| }}
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| ===string.reverse (s)===
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| Returns a string that is the string ''s'' reversed.
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| {{Example|
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| <pre>
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| print(string.reverse ("!moM ,olleH"))
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| Will result in:
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| Hello, Mom!
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| </pre>
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| }}
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| ===string.sub (s, i [, j])===
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| Returns the substring of s that starts at i and continues until j; i and j may be negative. If j is absent, then it is assumed to be equal to -1 (which is the same as the string length). In particular, the call string.sub(s,1,j) returns a prefix of s with length j, and string.sub(s, -i) returns a suffix of s with length i.
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| {{Example|
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| <pre>
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| print(string.sub ("Hi Mom!", 1, 4))
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| Will result in:
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| Hi M
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| </pre>
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| <pre>
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| print(string.sub ("Hi Mom!", 1))
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| Will result in
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| Hi Mom!
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| </pre> | |
| }}
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| ===string.upper (s)===
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| Receives a string and returns a copy of this string with all lowercase letters changed to uppercase. All other characters are left unchanged. The definition of what a lowercase letter is depends on the current locale.
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| {{Example|
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| <pre>
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| print(string.upper ("Hi Mom!"))
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| Will result in:
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| HI MOM!
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| </pre>
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| }}
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| ===Patterns===
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| Click here for info about [[Patterns | patterns]].
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| ===string.gmatch (s, [[Patterns|pattern]])===
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| Returns an iterator function that, each time it is called, returns the next captures from [[Patterns|pattern]] over string s. If pattern specifies no captures, then the whole match is produced in each call.
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| As an example, the following loop
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| s = "hello world from Lua"
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| for w in string.gmatch(s, "%a+") do
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| print(w)
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| end
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| will iterate over all the words from string s, printing one per line. The next example collects all pairs key=value from the given string into a table:
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| t = {}
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| s = "from=world, to=Lua"
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| for k, v in string.gmatch(s, "(%w+)=(%w+)") do
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| t[k] = v
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| end
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| For this function, a '^' at the start of the pattern does not work as an anchor, as this would prevent the iteration.
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| {{Example|
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| <pre>
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| for q in string.gmatch ("send money mom", "%a+") do
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| print (q)
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| end
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| Will result in:
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| send
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| money
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| mom
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| </pre>
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| }}
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| ===string.gsub (s, [[Patterns|pattern]], repl [, n])===
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| Returns a copy of s in which all (or the first n, if given) occurrences of the pattern have been replaced by a replacement string specified by repl, which may be a string, a table, or a function. gsub also returns, as its second value, the total number of matches that occurred.
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| If repl is a string, then its value is used for replacement. The character % works as an escape character: any sequence in repl of the form %n, with n between 1 and 9, stands for the value of the n-th captured substring (see below). The sequence %0 stands for the whole match. The sequence %% stands for a single %.
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| If repl is a table, then the table is queried for every match, using the first capture as the key; if the pattern specifies no captures, then the whole match is used as the key.
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| If repl is a function, then this function is called every time a match occurs, with all captured substrings passed as arguments, in order; if the pattern specifies no captures, then the whole match is passed as a sole argument.
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| If the value returned by the table query or by the function call is a string or a number, then it is used as the replacement string; otherwise, if it is false or nil, then there is no replacement (that is, the original match is kept in the string).
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| Here are some examples:
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| x = string.gsub("hello world", "(%w+)", "%1 %1")
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| --> x="hello hello world world"
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| x = string.gsub("hello world", "%w+", "%0 %0", 1)
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| --> x="hello hello world"
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| x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
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| --> x="world hello Lua from"
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| x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv)
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| --> x="home = /home/roberto, user = roberto"
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| x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s)
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| return loadstring(s)()
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| end)
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| --> x="4+5 = 9"
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| local t = {name="lua", version="5.1"}
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| x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t)
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| --> x="lua-5.1.tar.gz"
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| {{Example|
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| <pre>
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| s = "I have some oranges. Oranges are red."
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| print(string.gsub(s,"Orange","Apple"))
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| Will result in:
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| I have some oranges. Apples are red. 1
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| </pre>
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| }}
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