Pattern matching
ICU International Components for Unicode contains an implementation of the bidirectional algorithm — along with other internationalization services
ICU Homepage @ SourceForge.Net
Official ICU website ibm software globalization
Globalizing your e-business
History of QED bell labs who qed
History of QED
CL-PPCRE , a fast, portable, Perl-compatible regular expression library for Common Lisp.
CL-PPCRE - portable Perl-compatible regular expressions for Common Lisp
TRE A portable, POSIX-compliant library using a new fast algorithm. Also supports approximate matching. Can handle UTF-32 text.
TRE home page
xpressive , a C++ library
TPerlRegEx Open source Delphi VCL component based on PCRE (included)
Delphi for Win32 (Windows) and .NET - Regular Expressions
regex , Henry Spencer's regular expression library for C
regex - Henry Spencer's regular expression libraries
PCRE Open source C library supporting Perl-style regular expressions. Can handle UTF-8 text.
PCRE - Perl Compatible Regular Expressions
jlex , JLex: A Lexical Analyzer Generator for Java(TM)
JLex: A Lexical Analyzer Generator for Java(TM)
The GRETA Regular Expression Template Archive C++ library
The GRETA Regular Expression Template Archive for C++
TRegExpr library Delphi open source library
TRegExpr library  
WhatsMyIP.org Regexp Tester Simple web page to test a regular expression in PHP.
Regular Expression (RegExp) Tester
WebRegEx Free web-based tool to find regular expression matches in a given web page.
WebRegEx - Regular Expression Helper for Parsing Web Pages
^txt2regex$ Tool for building simple regular expressions from human language by answering the tool's questions. Generates regular expressions for 20 engines.
^txt2regex$
Boost.Regex C++ library with POSIX-Extended Syntax. A dialog to test regular expressions can be used freely. All sub-expressions and their matches are shown.
Boost.Regex: Index
TextTransformer Tool for building complete Parsers using the
The Regulator Free regular expressions testing and learning tool. Build and verify a regular expression against any text input, file or web. Displays matching, splitting or replacement results within an easy to understand, hierarchical tree.
Tcl Regular Expression Visualiser Tcl/Tk script for testing regular expressions.
trev
Regex.NET Tester Web page using .NET to test regular expressions online.
Regular Expression .NET Tester
Rex V an AJAX PCRE, Posix and Javascript Regular Expression Evaluator, written in PHP.
-
RegExSearchReplace Free tool to search-and-replace using a regular expression. Requires Java.
SourceForge.net: RegEx Search/Replace Tool
The Regex Coach Powerful interactive learning system to hone your regexp skills. Windows and Linux versions available.
The Regex Coach - interactive regular expressions
RegexBuilder Simple .NET tool to test regular expressions.
RegEx Builder
RegexBuddy Complete tool for learning, creating, testing and saving regular expressions, with two-way conversion between regex syntax and plain English building blocks, and a debugger that lets you see inside the regex engine. Windows and Linux versions available.
RegexBuddy: Learn, Create, Understand, Test, Use and Save Regular Expression
Redet A tool for creating and executing regular expressions in Tcl or any of 30+ other programs. Provides palettes constructed by executing a test suite, persistent history, ability to change locale while running, character entry tools and extensive help. Handl
Redet
PowerGREP Feature-rich Windows application to search, search-and-replace and collect data using one or more regular expressions.
PowerGREP: Windows grep Software to Search (and Replace) through Files and Folders on Your PC and Network
PCRE Workbench Simple regular expression tester for Windows, based on PCRE.
PCRE Workbench
LogBud Online regular expression testing for PHP
LogBud - WebMasters OnLine Tools
KRegExpEditor open source KDE widget for visually creating regular expressions
Example of the KDE regular expression widget
Who is http://www.froola.com?
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Bi-directional text , International Components for Unicode , QED (text editor) , Regular expression , .
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