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Regular Expressions may be used in a various Programming Languages
POSIX extended CXXI. Regular Expression Functions (POSIX Extended). PHP also supports regular expressions using a Perl-compatible syntax using the PCRE functions. Those functions support non-greedy matching, assertions, conditional subpatterns, and a number of other features not supported by the POSIX-extended regular expression syntax.
CXVI. Regular Expression Functions (For PHP) (Perl-Compatible). (PCRE). The syntax for patterns used in these functions closely resembles Perl. The expression should be enclosed in the delimiters, a forward slash (/), for example. Any character can be used for delimiter as long as it's not alphanumeric or backslash (\). If the delimiter character has to be used in the expression itself, it needs to be escaped by backslash. Since PHP 4.0.4, you can also use Perl-style (), {}, [], and <> matching delimiters. See Pattern Syntax for detailed explanation. The ending delimiter may be followed by various modifiers that affect the matching. See Pattern Modifiers. PHP also supports regular expressions using a POSIX-extended syntax using the POSIX-extended regex functions.RegEx is a small and very simple utility that tests regular expressions before using them. It will tell you if there is a match or not and the value of captures if any. It also includes a comprehensive cheat sheet. Very useful if you deal with regular expressions on a daily basis. From Tredo Soft
Microsoft Beefs Up VBScript with Regular Expressions (Scripting Clinic) More BASIC/Visual BASIC
The Joy of Regular Expressions Part 1, Part 2, Part 3 From Site Point
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Regular Expressions Builder Library is a class library that adds object-oriented layer of bastraction onto .net Regex engine to help developer create even very complicated regular expression, but instead of working with bare strings you get strongly typed, clear object model, and intellisence . This makes it is easier, faster and less error prone to create regular expressions. Library will also enforce some best practices, help avoid pitfalls and even fine tune resulting regex string to work faster.
STREGEX function performs regular expression matching against the strings contained in StringExpression. STREGEX can perform either a simple boolean True/False evaluation of whether a match occurred, or it can return the position and offset within the strings for each match. The regular expressions accepted by this routine, which correspond to "Posix Extended Regular Expressions", are similar to those used by such UNIX tools as egrep, lex, awk, and Perl.
PCRE, (Perl Compatible Regular Expressions), Library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as PERL, with just a few differences.
Perlre - PERL regular expressions
Spec Explorer. A tool that extends Visual Studio for modeling software behavior, analyzing that behavior by graphical visualization, model checking; and generating standalone test code from models. Behavior is modeled in two ways: by writing rule machines in C# (with dynamic data-defined state spaces) and by defining scenarios as action patterns in a regular-expression style.
Brief note: Non-greedy quantifiers have the same syntax as regular greedy ones, except with the quantifier followed by a question-mark. For example, a non-greedy pattern might look like: "/A[A-Z]*?B/". In English, this means "match an A, followed by only as many capital letters as are needed to find a B."
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