From: "cyber c." <lists@...>
Date: 2012-06-07T08:08:50+09:00
Subject: Pattern matching strings

Hi,

I dont understand why this doesnt work

Valid: aecd, efcd, mncd
Invalid: if ab comes before cd like abcd


Reg exp : /(?!ab)cd/

But this doesn't work. I looked at this tutorial
http://www.tutorialspoint.com/ruby/ruby_regular_expressions.htm which
says something of this kind should work.

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