Xeger is design for your need to solve problems using regular expressions on either your iPad or your iPhone.
You can create your own presets, share them with style on Twitter or read through the examples I provided.
Xeger also works as a interactive tutorial as you can change and try out different expressions and see the result live in the application.
Key Features
*Designed for iOS7
*Designed for both iPhone and iPad
*Syntax Highlightning
*Extended keyboard
*Share on twitter