RegEx Knife version 1.0.5 is available in the App Store. This version fixes a crashing bug that occurs when working with Regular Expressions containing 10 or more capture groups.

More about RegEx Knife.

RegEx Knife has had 622 downloads so far (~60/month) - still hardly a rush. Clearly the iPad isn’t the best place to be doing RegEx development, but its handy when you need it.