PHPSQLParser\positions\PositionCalculator::findPositionWithinString PHP Method

    protected function findPositionWithinString($sql, $value, $expr_type)
    {
        $offset = 0;
        $ok = false;
        while (true) {
            $pos = strpos($sql, $value, $offset);
            // error_log("pos:$pos value:$value sql:$sql");
            if ($pos === false) {
                break;
            }
            $before = "";
            if ($pos > 0) {
                $before = $sql[$pos - 1];
            }
            // if we have a quoted string, we every character is allowed after it
            // see issue 137
            $quoted = $sql[$pos + strlen($value) - 1] === '`';
            $after = "";
            if (isset($sql[$pos + strlen($value)])) {
                $after = $sql[$pos + strlen($value)];
            }
            // if we have an operator, it should be surrounded by
            // whitespace, comma, parenthesis, digit or letter, end_of_string
            // an operator should not be surrounded by another operator
            if (in_array($expr_type, array('operator', 'column-list'), true)) {
                $ok = $before === "" || in_array($before, self::$allowedOnOperator, true) || strtolower($before) >= 'a' && strtolower($before) <= 'z';
                $ok = $ok && ($after === "" || in_array($after, self::$allowedOnOperator, true) || strtolower($after) >= 'a' && strtolower($after) <= 'z');
                if (!$ok) {
                    $offset = $pos + 1;
                    continue;
                }
                break;
            }
            // in all other cases we accept
            // whitespace, comma, operators, parenthesis and end_of_string
            $ok = $before === "" || in_array($before, self::$allowedOnOther, true);
            $ok = $ok && ($after === "" || in_array($after, self::$allowedOnOther, true) || $quoted && (strtolower($after) >= 'a' && strtolower($after) <= 'z'));
            if ($ok) {
                break;
            }
            $offset = $pos + 1;
        }
        return $pos;
    }