Text processing for C/C++ programmers
- John Maddock, the author of RegEx++, explains how to use Regular Expressions in C/C++ programs.
- http://www.ddj.com/184404797

TRE
- Lightweight, robust, and almost fully POSIX compliant regexp matching library which supports approximate matches. [GNU GPL].
- http://laurikari.net/tre//

Grammar to parser classes
- C++ template classes for declaring grammars directly in the code as set of compound classes. Includes regexp_parser class for parsing input upon regular expression definition provided in its constructor.
- http://sourceforge.net/projects/grammar2parser/

xpressive
- A C++ regex template library that allows regexes to be written as strings or as expression templates and to refer to themselves and other regexes recursively.
- http://boost-sandbox.sourceforge.net/libs/xpressive/

PCRE Win32
- Provides compile PCRE libraries for Windows developers, and source code to build with Visual C++.
- http://www.psyon.org/projects/pcre-win32/

Rx - Posix Basic Regular Expressions
- Documentation from the GNU rx library.
- http://www.dc.turkuamk.fi/docs/gnu/rx/rx_3.html

GRETA
- A fast C++ template library for Perl-compliant regular expression pattern matching. GRETA compiles on VC7 and gcc.
- http://research.microsoft.com/projects/greta/

C++ Regular Expression Library
- A free component that enables the use of regular expression searching in a C++ program.
- http://www.tropicsoft.com/Components/RegularExpression/

regex
- A modified version of Henry Spencer's regular expression library (Autoconf, Automake and Libtool scripts have been added and a few file names have been changed). Also related links.
- http://arglist.com/regex/

PCRE - Perl Compatible Regular Expressions
- A C library for matching regular expressions with Perl 5 syntax and semantics. PCRE has its own native API, as well as a set of wrapper functions that correspond to the POSIX regular expression API.
- http://www.pcre.org/