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Official Documentation Links

Erlang: re man page

Go: golang.org | re2 syntax

Haskell: Text.Regex | haskellwiki | Text.Regex.TDFA | Text.Regex.TDFA.Common

JavaScript: MDN Regular Expressions | MDN RegExp Object | w3schools

MySQL: MySQL Reference Manual

.Net: MSDN | overview | best practices | behavior details

Perl: perldoc | Intro (perlrequick) | Tutorial (perlretut)

PHP: PCRE overview | Syntax

PostgreSQL: Pattern Matching docs

Python: re pyDoc | howto

Ruby: Regexp Ruby-Doc | Programming Ruby

Rust: Regex docs.rs | Struct regex::Regex | Struct regex::RegexBuilder

Tcl: Tcl8.5 regexp docs

XRegExp: XRegExp Syntax | XRegExp option flags | API | Browser fixes | Addons

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