This is the revision history for learn balanced parentheses in <*:##NULL>
| factoid_id | subject | copula | predicate | author | namespace |
|---|---|---|---|---|---|
| 3613 | learn balanced parentheses | is | print "OK" if /^(?{local $d=0})(\((?{$d++})|\)(?{$d--})(?(?{$d<0})(?!))|(?>[^()]+))*(?(?{$d!=0})(?!))$/' prints "OK" if, and only if, $_ has proprely balanced parentheses | perlbot |