Highly recommended.

This app has already proven itself very useful when I need a quick way of checking whether my regex is actually matching the text I think its matching. For that alone, its worth the price. The reference sheet is also very useful. My only suggestion for an improvement would be providing support for complete regexes - ie, if I select Perl as the language, I should be able to evaluate s/^[Ff]o.+/Bar/ and see the output. As it is, entering ^[Ff]o.+ will show me what text is matched, and I can provide replacement text in the "Replace" panel, but I cant construct the full regex that Id use in a Perl script. Otherwise, this is a fantastic app, and well worth it to anyone who finds themselves dealing with regexes just often enough that they dont always remember the right syntax.

binarygladiator about Patterns - The Regex App, v1.0.1