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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <[email protected]> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ $operators = ['not', '!', 'or', '||', '&&', 'and', '|', '^', '&', '==', '===', '!=', '!==', '<', '>', '>=', '<=', 'not in', 'in', '..', '+', '-', '~', '*', '/', '%', 'matches', '**']; $operators = array_combine($operators, array_map('strlen', $operators)); arsort($operators); $regex = []; foreach ($operators as $operator => $length) { // Collisions of character operators: // - an operator that begins with a character must have a space or a parenthesis before or starting at the beginning of a string // - an operator that ends with a character must be followed by a whitespace or a parenthesis $regex[] = (ctype_alpha($operator[0]) ? '(?<=^|[\s(])' : '') .preg_quote($operator, '/') .(ctype_alpha($operator[$length - 1]) ? '(?=[\s(])' : ''); } echo '/'.implode('|', $regex).'/A';