regexfield.php

<?php
 
namespace Bitrix\Main\PhoneNumber\Tools;
 
use Bitrix\Main\SystemException;
 
class RegexField extends XmlField
{
    public function decodeValue($value)
    {
        return static::validateRegex($value, true);
    }
 
    public static function validateRegex($regex, $removeWhitespace = false)
    {
        $compressedRegex = $removeWhitespace ? preg_replace('/\\s/', '', $regex) : $regex;
 
        // Match regex against an empty string to check the regex is valid
        if (preg_match('/'.$compressedRegex.'/', '') === false)
        {
            throw new SystemException("Regex error: ".preg_last_error());
        }
 
        return $compressedRegex;
    }
 
}