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Re^2: Using regex to match double letters, and only double letters

by ysth (Canon)
on Dec 30, 2005 at 10:29 UTC ( [id://519972]=note: print w/replies, xml ) Need Help??


in reply to Re: Using regex to match double letters, and only double letters
in thread Using regex to match double letters, and only double letters

Lots of things you can do with backreferences. Even check for primes: 
perl -wle 'print "Prime" if (1 x shift) !~ /^1?$|^(11+?)\1+$/'

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