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  1. or download this
    use v5.10;
use warnings;
...
$var = "path_to_my_lib";
$var =~ m/(lib)/;
say $1;
  2. or download this
    if($1){
        say $1;
}
  3. or download this
    if( $var =~ m/(foo)/ ){
        say $1;
}else{
        say "no match found";
}