">>> X<m> <<<" in perlop

       m/PATTERN/msixpogc
       /PATTERN/msixpogc
               Searches a string for a pattern match, and in scalar context
               returns true if it succeeds, false if it fails.  If no string
               is specified via the "=~" or "!~" operator, the $_ string is
               searched.  (The string specified with "=~" need not be an
               lvalue--it may be the result of an expression evaluation, but
...