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drwxr-xr-x 2 30094 users 3 Oct 6 10:16 .
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-rw-r--r-- 1 30094 users 1064 Apr 5 2022 generate_operator_regex.php

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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* 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';