Test tool -Testing Regular Expression Match Patterns

Regular expression started in Perl language. But it is now used everywhere: text editors, programming languages, and software testing tools. Regular expression is powerful, but hard to learn. This page allows you to learn and test regular expression with your own strings, match patterns, sub patterns, and modifiers.

http://sqa.fyicenter.com/Online_Test_Tools/Test_Regular_Expression_Match_Pattern.php