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Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are supported in many programming languages. Library implementations are often called an "engine", [4] [5] and many of these are ...
Regular Expression Flavor Comparison – Detailed comparison of the most popular regular expression flavors; Regexp Syntax Summary; Online Regular Expression Testing – with support for Java, JavaScript, .Net, PHP, Python and Ruby; Implementing Regular Expressions – series of articles by Russ Cox, author of RE2; Regular Expression Engines
Visual Basic is not case sensitive, which means that any combinations of upper and lower case letters in keywords are acceptable. Visual Studio automatically converts all Visual Basic keywords to the default capitalised forms, e.g. "Public", "If". C# is case sensitive and all C# keywords are in lower cases.
Visual Basic ' LineComment Rem LineComment ' BlockComment _ BlockComment Rem BlockComment _ BlockComment [c] Visual Basic .NET ' LineComment ''' LineComment (XML documentation comment) Rem LineComment. #If COMMENT Then BlockComment #End If: Visual Prolog % LineComment /* BlockComment */ Wolfram Language (* BlockComment *) Xojo ' LineComment ...
Tools have been written that automatically generate a lexer from a lexical specification written in regular expressions and a parser from the phrase grammar written in BNF: this allows one to use declarative programming, rather than need to have procedural or functional programming. A notable example is the lex-yacc pair.
Visual Basic .NET, Visual Basic for Applications, Windows Forms, Gambas, Xojo, Basic4ppc, Basic4android, and NS Basic Visual Basic (VB), sometimes referred to as Classic Visual Basic , [ 1 ] [ 2 ] is a third-generation programming language based on BASIC , as well as an associated integrated development environment (IDE).
Greed, in regular expression context, describes the number of characters which will be matched (often also stated as "consumed") by a variable length portion of a regular expression – a token or group followed by a quantifier, which specifies a number (or range of numbers) of tokens. If the portion of the regular expression is "greedy", it ...
PCRE Perl Compatible Regular Expressions, a common modern implementation of string pattern matching ported to many languages; REBOL parse dialect for pattern matching used to implement language dialects; Symbolic integration; Tagged union; Tom (pattern matching language) SNOBOL for a programming language based on one kind of pattern matching