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Regular expressions (or regex) are a common and very versatile programming technique for manipulating strings. On Wikipedia you can use a limited version of regex called a Lua pattern to select and modify bits of text from a string. The pattern is a piece of code describing what you are looking for in the string.
This module is intended to provide access to basic string functions. Most of the functions provided here can be invoked with named parameters, unnamed parameters, or a mixture. If named parameters are used, Mediawiki will automatically remove any leading or trailing whitespace from the
<string>.rpartition(separator) Searches for the separator from right-to-left within the string then returns the sub-string before the separator; the separator; then the sub-string after the separator. Description Splits the given string by the right-most separator and returns the three substrings that together make the original.
Wrap the string in quotes; quotes can be chosen for a specific language. Will not quote an empty string, and will not quote if there is a quote at the start or end of the (trimmed) string. 1 Input text (will be automatically trimmed); may be empty. 2
The template takes a substring of ''text'' starting at ''start'' and containing ''length'' characters. Template parameters Parameter Description Type Status Text 1 The substring to be trimmed. String required Numeric position 2 Numeric position of the starting character within the string Number required Count 3 Number of characters for the substring Number required See also
Use Module:String.sub internally. We only need a wrapper that handles the basic input values. i, j are as defined in the Module:String.sub. Negative values are accepted. i, j can get default values: i=1, j=len; Basic parameters. All params are optional. For readability here names i, sublen, j are used; in the template they are the unnamed ...
The string-search functions in Lua script can run extremely fast, comparing millions of characters per second. For example, a search of a 40,000-character article text, for 99 separate words (passed as 99 parameters in a template), ran within one second of Lua CPU clock time.
String interning is supported by some modern object-oriented programming languages, including Java, Python, PHP (since 5.4), Lua [4] and .NET languages. [5] Lisp , Scheme , Julia , Ruby and Smalltalk are among the languages with a symbol type that are basically interned strings.