Very decent, but..

Its a very decent app, the fact that you can use different technologies to perform the regex is priceless. However it currently has a very annoying bug where it scrolls to the bottom of the search text whenever you modify the regular expression. If you have to scroll at all (I prefer you keep my scroll position) then scroll to the top.

Not a serious bug, but still frustrating.

Other than that, awesome app and infinitely useful if you use regexes on a weekly basis.

Naatan85 about Patterns - The Regex App, v1.0