a => 'a' =~ m/b/, b => 'asdf' #### 'a', 'a' =~ m/b/, 'b', 'asdf' #### 'a', 'b', 'asdf' #### a => scalar( 'a' =~ m/b/ ), b => 'asdf' #### a => !!( 'a' =~ m/b/ ), b => 'asdf' #### a => 'a' =~ m/b/ ? 1 : 0, b => 'asdf'