Mô đun:String2/tài liệu

The module String2 contains five case-related calls that convert strings to upper, lower, sentence or title case and two calls that are useful for working with substrings. There are two utility calls that strip leading zeros from padded numbers and transform text so that it is not interpreted as wikitext.

**Functions**

**upper**
The upper function simply converts all characters to upper case.

**lower**
The lower function simply converts all characters to lower case.

**title**
The title function capitalises the first letter of each word in the text, apart from a number of short words recommended by The U.S. Government Printing Office Style Manual: a, an, the, at, by, for, in, of, on, to, up, and, as, but, or, and nor.

**sentence**
The sentence function finds the first letter and capitalises it, then renders the rest of the text in lower case. It works properly with text containing wiki-markup. Compare  -> #invoke:String2|sentence|action game with  -> . Piped wiki-links are handled as well:-  -> #invoke:String2|sentence|trimix
So are lists:-  → 

**ucfirst**
The ucfirst function is similar to sentence; it renders the first alphabetical character in upper case, but leaves the capitalisation of the rest of the text unaltered. This is useful if the text contains proper nouns, but it will not regularise sentences that are ALLCAPS, for example. It also works with text containing piped wiki-links and with html lists. label is an alias to this function for backward compatibility.(now obselete)

**findlast**
 Function findlast finds the last item in a list.- The first unnamed parameter is the list. The list is trimmed of leading and trailing whitespace- The second, optional unnamed parameter is the list separator (default = comma space). The separator is not trimmed of leading and trailing whitespace (so that leading or trailing spaces can be used).- It returns the whole list if the separator is not found.
One potential issue is that using Lua special pattern characters (^$()%.*+-?) as the separator will probably cause problems.
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**posnq**
 posnq (position, no quotes) returns the numerical start position of the first occurrence of one piece of text ("target") inside another ("source"). UTC characters are supported.- It returns nil by default if no match is found, or if either parameter is blank. If no match is found it can return the value of an optional "nomatch" parameter.- It takes the text to be searched in as the first unnamed parameter (or source), which is trimmed.- It takes the text to match as the second unnamed parameter (or target), which is trimmed and any double quotes " are stripped out. That allows spaces at the beginning or end of the match string to be included in a consistent manner.- It can take an optional third unnamed parameter (or plain), which is trimmed. If it's set to false, then the search accepts Lua pattern-matching for the target, otherwise a plain search is used.- It can take an optional fourth unnamed parameter (or nomatch), which is trimmed. This value is returned if no match occurs. Setting 0 makes the output compatible with the find function in Module:String.
 Examples
  → ext
  → ent
  → " pie"
  → " ece"
  → target=ece
  → plain=true
  → plain=false
  → nomatch=0
  → nomatch=0
  → 0
  → 0
  → target=afé

**split**
The split function splits text at boundaries specified by separator and returns the chunk for the index idx (starting at 1). It can use positional parameters or named parameters (but these should not be mixed):
Any double quotes (") in the separator parameter are stripped out, which allows spaces and wikitext like  to be passed. Use ! for the pipe character |.
If the optional plain parameter is set to false / no / 0 then separator is treated as a Lua pattern. The default is plain=true, i.e. normal text matching.
The index parameter is optional; it defaults to the first chunk of text.
The Template:Stringsplit is a convenience wrapper for the split function.

**stripZeros**
The stripZeros functions finds the first number in a string of text and strips leading zeros, but retains a zero which is followed by a decimal point. For example: "0940" -> "940"; "Year: 0023" -> "Year: 23"; "00.12" -> "0.12"

**nowiki**
The nowiki function ensures that a string of text is treated by the MediaWiki software as just a string, not code. It trims leading and trailing whitespace.

**val2percent**
The val2percent functions scans through a string, passed as either the first unnamed parameter or |txt=, and converts each number it finds into a percentage, then returns the resulting string.

**one2a**
The one2a function scans through a string, passed as either the first unnamed parameter or |txt=, and converts each occurrence of 'one ' into either 'a ' or 'an ', then returns the resultant string.
The Template:One2a is a convenience wrapper for the one2a function.

**findpagetext**
The findpagetext function returns the position of a piece of text in the wikitext source of a page. It takes up to four parameters:- First positional parameter or |text is the text to be searched for.- Optional parameter |title is the page title, defaults to the current page.- Optional parameter |plain is either true for a plain search (default), or false for a Lua pattern search.- Optional parameter |nomatch is the value returned when no match is found; default is nothing.
 Examples
  → text=Youghiogheny
  → nomatch=not found
  → nomatch=not found
  → nomatch=not found
  → #invoke:String2 |findpagetext |text=Rriver |title=Boston Bridge |plain=false |nomatch=not found
  → #invoke:String2 |findpagetext |text=%%nomatch=not found