Non-Standard / High Port Detection Regex for Python

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching non-standard / high port detection, ported and verified for Python. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your Python project — whether you're validating in a Django view, a FastAPI endpoint, or a standalone data processing script.

Python Implementation

# Non-Standard / High Port Detection
# ReDoS-safe | RegexVault — Web & Network > Port

import re

nonstandard_high_port_detection_pattern = re.compile(r'https?://[^:/\s]+:([1-9][0-9]{3,4})(?=/|\?|#|$)')

def validate_nonstandard_high_port_detection(value: str) -> bool:
    return bool(nonstandard_high_port_detection_pattern.fullmatch(value))

# Example
print(validate_nonstandard_high_port_detection("http://example.com:8080/path"))  # 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 Python developers because particularly important in Python web servers where CPU-bound regex operations can stall concurrent request handling. 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

Capture group 1 contains the port number. Ports 1–999 (single and triple digits) are excluded — this targets 4–5 digit non-standard ports. Useful for security scanning and alerting.