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Regular Expressions

 
AnswerRe: how to make username regex for windows forms Pin
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Peter_in_27804-Oct-12 2:51
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Same negative trick works, doesn't it?
(?!\.[^.]*\.)(?!\-[^-]*\-)(?!\_[^_]*\_)
Or (?![.-_][^.-_]*[.-_]) if he wants at most one of any of the three.

Cheers,
Peter
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012

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