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  1. or download this
    my $str="axx12yya";
if($str=~m/12(?=.*a)/)
{
    print "match \n";
}
  2. or download this
    my $str="axx12yya";

...
{
    print "match \n";
}
  3. or download this
    Variable length lookbehind not implemented before HERE mark in regex m
+/12(?<=a.*
) << HERE / at test2.pl line 3.