Testimonial from Michael Weinhardt [mikedub@telstra.com]:
What I thought was cool:
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I tend to build regular expressions from scratch and build them bit by bit.
It's really helpful to be able to see the results of adding new bits to
the expression, one at a time
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Simply allowing me to cut, copy and paste let me easily construct increasingly
complex input "text to match" variations
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Being able to save allows me to experiment with regular expressions, easily
reverting back to a working expression if needed. I can also build a
library of regular expressions for quick reference.