P.S. to a prev post

carrying over from :

http://groups-beta.google.com/group/regex/browse_thread/thr
ead/3b8eca76e8ec4440/feb1adabf0a143d4#feb1adabf0a143d4


robertospara, u wrote


> Don't play smarter than you are and hear really smarter


i think u got carried away with your remarks. I can say that
those
words pertain to u too. People on this forum have been
treating each
other in a more professional and decent way, for your
information.

the task can be accomplished in one regex:


^(?:([a-d])(?!.*1))+$


**validates a str with 4 permitted alphas w/o any repeats**


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alternatively, but more slow:

^(?!.*([a-d]).*1)[a-d]+$


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