[TYPO3-50-general] Package Key Guidelines

Jochen Rau j.rau at web.de
Mon May 5 11:15:19 CEST 2008

Hi Sebastian,

> Is the following Regular Expression OK?
> ^[A-Z][a-zA-Z0-9_]$

This RegEx won't work. At least you have to add a quantifier for the 
second expression, like:


But this RegEx matches faulty package keys like


I'll try to develop a better solution and post it here.

BTW, a good testing facility for RegEx can be found here:



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