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Introducing Oyster

Regular expressions are a powerful tool for developers, but they aren't the easiest things to build and debug. Oyster helps you interactively build and test them, 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 clip-board or by dragging out the pip into your desired editor. Oyster is also integrated with snippet editors

You're not alone either, Oyster has built in integration with Oyster Farm, an online repository for pearls. You can download something that seems to fit the bill for you, and tweak it into what you would like. You can even share your changes, or entirely new pearls of your own.


Oyster requires Mac OS X 10.8 or later. Dash snippet integration requires Dash 1.8.5. Oyster can generate code in the following languages:
  • Swift
  • C#
  • JavaScript
  • JSP
  • Java
  • Objective-C (NSRegularExpression & NSPredicate)
  • Perl
  • PHP
  • Python
  • Ruby
  • Tcl/Tk