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if( $string =~ /e/g ) {
  my $start_pos = pos($string) - 1;
...
efg
efghijklfg
efghijklfghijklabcdefg

$string = 'abcdefghijklfghijklabcdefg';
while( $string =~ /e/g ) {
...
efghijklfg
efghijklfghijklabcdefg
efg