On firefox, there are quite a few regular expression tester add-ons. Unfortunately, there has not been any for Chrome yet. So I decided to make a simple one.
Here it is, Regular Expression Checker 1.0
Simple regular expression checker/tester.
==== Features under development ====
1. save regular expressions
2. provide a library of pre-built regular expressions
3. replace feature
4. regex match status (how many matches, how many subpatterns, etc)