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Oyster helps you interactively build and test regular expressions--which aren't the easiest things to build and debug--storing each "pearl" in an easy-to-access library.

With powerful syntax highlighting, dynamic updates of matches, and the results of replacement patterns in test text, it has never been easier to build and test your regular expressions. Once you've got it just the way you like it, Oyster lets you copy the code in one of 11 languages onto the clipboard or by dragging out the pip into your desired editor. Starting with Dash 1.8.5 (coming August 2013) you can even save your regular expression as a

What's New

Version 1.4:
  • Greatly improved the feedback on matches and sub-groups. Oyster now highlights the whole match, and all sub-groups (and sub-sub-sub groups etc) much more clearly.


  • OS X 10.9 or later

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Oyster User Discussion


Current Version (1.x)


Downloads 510
Version Downloads 232
License Commercial
Date 21 Jun 2014
Platform Intel 64 / OS X
Price $4.99
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