When I am doing some programing, I may need the Regular Expression rule to validate the data user submit.
It is used to protect the program and save the resource of server.
To write a perfect Regular Expression Rule is not easy. You need try and try, test and test.
Until I found this site , Regular Expression Library.
I choose this one to test the URL user entered.


It works well.
Regular Expression Library has lots of expression. You always can find one suitable for your needs.

David Yin

David is a blogger, geek, and web developer — founder of FreeInOutBoard.com. If you like his post, you can say thank you here

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