TPerlRegEx for Delphi 2009 had a rather embarrasing bug: it didn’t actually enable the UTF-8 support in PCRE if you did not set the Options property to something different than the default.

The R language is now covered on regular-expressions.info, and supported by RegexBuddy.

Windows PowerShell is now covered on regular-expressions.info, and supported by RegexBuddy.

TPerlRegEx is a Delphi VCL component wrapper around the open source PCRE library. I originally developed it for in-house use. It powered EditPad Pro 4 and 5, PowerGREP 1 and 2, and RegexBuddy 1. The latest versions of these products use a custom-built regular expression engine. The custom-built engine can do [...]

A RegexBuddy user pointed me to LIB_MYSQLUDF_PREG. This is an open source library of MySQL user functions that imports the PCRE library.
MySQL’s built-in regular expression support uses the POSIX ERE flavor. By todays standards, that flavor offers limited regex functionality. PCRE on the other hand offers all the goodies from Perl and [...]