Misc::uncomment_rfc822( $string ): string

1751    public static function uncomment_rfc822($string)1752    {1753        $string = (string) $string;1754        $position = 0;1755        $length = strlen($string);1756        $depth = 0;1757 1758        $output = '';1759 1760        while ($position < $length && ($pos = strpos($string, '(', $position)) !== false) {1761            $output .= substr($string, $position, $pos - $position);1762            $position = $pos + 1;1763            if ($string[$pos - 1] !== '\\') {1764                $depth++;1765                while ($depth && $position < $length) {1766                    $position += strcspn($string, '()', $position);1767                    if ($string[$position - 1] === '\\') {1768                        $position++;1769                        continue;1770                    } elseif (isset($string[$position])) {1771                        switch ($string[$position]) {1772                            case '(':1773                                $depth++;1774                                break;1775 1776                            case ')':1777                                $depth--;1778                                break;1779                        }1780                        $position++;1781                    } else {1782                        break;1783                    }1784                }1785            } else {1786                $output .= '(';1787            }1788        }1789        $output .= substr($string, $position);1790 1791        return $output;1792    }