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Regexp with //x

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From:
perl
Date:
December 30, 2002 21:36
Subject:
Regexp with //x
Message ID:
Pine.LNX.4.44.0212302115540.3815-100000@formicary.antiform.com

Can anyone tell me where to find out what the x does when used at the end 
of a pattern match? (i.e. $tag =~ /abc/x) Everywhere  I've looked gives 
me the helpful information that it means "Use extended regular 
expressions," but I've yet to find a definition of what that *means*. 

Thanks...



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