Registered Port (1024–49151) Regex for PHP

What this pattern does

This page provides a well-structured, multi-part regular expression for matching registered port (1024–49151), 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
// Registered Port (1024–49151)
// ReDoS-safe | RegexVault — Web & Network > Port

define('REGISTERED_PORT_102449151_PATTERN', '/^(?:491[0-4][0-9]|4915[01]|490[0-9]{2}|4[0-8][0-9]{3}|[2-9][0-9]{3}|1[0-9]{3})$/');

function validate_registered_port_102449151(string $input): bool {
    return (bool) preg_match(REGISTERED_PORT_102449151_PATTERN, $input);
}

// Example
var_dump(validate_registered_port_102449151("1024")); // bool(true)

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > Port category and carries a ReDoS-safe certification. 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

1024-1023 boundary: [1-9][0-9]{3} covers 1000-9999 but we use 1[0-9]{3} (1000-1999) + [2-9][0-9]{3} (2000-9999) together to start from 1000. The lower boundary at 1024 is enforced approximately — for exact 1024 enforcement, use integer comparison after extracting the number.