Just wanted to share some useful links with you. If you often use regular expressions, you might find useful to check them online or anywhere else before your code is executed.
First of all, an Online Service that seems to be free: RegExr: Online Regular Expression Testing Tool It allows you to check whatever you want and has most useful meta symbols built in.
If you are on Windows, you might like this tool: TRegExpr It allows you to check your code in Windows without the necessity to execute it first. Just paste a sample of the text you’re working with and check the results immediately. Software is written in Delphi and is free for personal use.
The next site is Sexyregex.com. You can find regex library there, so it is not just testing, but also giving you ideas for your own needs.
If you have any other interesting sites, you’re welcome to share them with me. Just let me know and I will add them to this page.