Regex Tester

Regex Tester is an app that lets you test your regular expressions.

You can create new regular expressions and save them for later use. There are inbuilt saved regular expressions that are commonly used.

If you need to change a regular expression you've save or which to delete one; hold down on the saved regex and select it from the context menu. You can even share you regular expressions!

The app also includes a quick cheat-sheet to regular expressions.