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

by choroba (Cardinal)
on Apr 16, 2018 at 15:39 UTC ( [id://1212999]=note: print w/replies, xml ) Need Help??

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  1. or download this
    #!/usr/bin/perl
    use warnings;
    ...
        say $2 while $s =~ /(?|^((.))\2(?!\2)
                              |(?<=(.)(?!\1))(.)\2(?!\2))/gx;
    }
    
  2. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
    }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
    

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