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   qr/^  ab\+cd   \(12\)34$/
   qr/^\s{2}[a-z]{2}\+[a-z]{2}\s{3}\(\d{2}\)\d{2}$/
   qr/^\s+[a-z]+\+[a-z]+\s+\(\d+\)\d+$/
   qr/^\s+\S+\s+\S+$/

   $str = '  ab+cd   (12)34';
   $str = quotemeta($str);
...

   Output:
   (?i-xsm:\\s+\\s+[a-z][a-z]\+[a-z][a-z]\\s+\\s+\\s+\(\d\d\)\d\d)

   $str = '  ab+cd   (12)34';
   $str = quotemeta($str);
...

   Output:
   (?i-xsm:\s+[a-z][a-z]\+[a-z][a-z]\s+\(\d\d\)\d\d)