RTL Language Indicator Regex for PHP

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching rtl language indicator, ported and verified for PHP. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your PHP project — whether you're validating in a Laravel validator, a WordPress plugin, or a standalone PHP script.

Php Implementation

<?php
// RTL Language Indicator
// ReDoS-checked | RegexVault — Localization > Locale & Language

define('RTL_LANGUAGE_INDICATOR_PATTERN', '/^[؀-ۿ֐-׿ݐ-ݿﭐ-﷿ﹰ-]/');

function validate_rtl_language_indicator(string $input): bool {
    return (bool) preg_match(RTL_LANGUAGE_INDICATOR_PATTERN, $input);
}

// Example
var_dump(validate_rtl_language_indicator("مرحبا")); // bool(true)

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Locale & Language category and has been checked for ReDoS risk. That matters for PHP developers because especially relevant in PHP where PCRE backtracking limits can trigger silent failures on malicious input. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

Unicode ranges: 0600-06FF (Arabic), 0590-05FF (Hebrew), 0750-077F (Arabic Supplement), FB50-FDFF (Arabic Presentation Forms A), FE70-FEFF (Arabic Presentation Forms B). Use for dynamic RTL layout detection, not for validation.