| Online Javascript Regular Expression Tester(pagecolumn.com) | javascripttesting |
| The Flex 3 Regular Expression Explorer(blog.ryanswanson.com) | testing |
| IsValidIP - Validating an IP address(devx.com) | patterns |
| Is Valid Internet Email Address(breakingpar.com) | patterns |
| Regular Expression Matching Can Be Simple And Fast(swtch.com) | advanced |