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  1. or download this
    use re 'debug';
$s = 'xfx';
while ($s =~ / (f*?) /gx) {
  2. or download this
    Compiling REx " (f*?) "
Final program:
...
                                  failed...
Match failed
Freeing REx: " (f*?) "
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    Match possible, but length=0 is smaller than requested=1, failing!
  4. 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,