Best Online Regular Expression Tools

Just wanted to share some time saving tools for Regex.

This tool generates regex code Javascript, PHP, Python and Ruby and have various functions like search, replace, etc
http://osteele.com/tools/rework/

This service uses PHP regular expression functions as a base for its operations. Nevertheless it can be useful for programmers of other languages as well. Please use Solmetra’s forums for support and bug reports.
http://www.solmetra.com/scripts/regex/index.php

Regular Expression Tester for
preg (PCRE) – reg (POSIX)
http://www.quanetic.com/regex.php

For Java:
http://www.fileformat.info/tool/regex.htm