This is the revision history for learn balanced parentheses in <matrix.org:#DYJOMClZbVOMHnzPQt:matrix.org>
factoid_id | subject | copula | predicate | author | namespace |
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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 | <*:##NULL> |