Spanish Código Postal Regex for Python

What this pattern does

This page provides a well-structured, multi-part regular expression for matching spanish código postal, 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

# Spanish Código Postal
# ReDoS-safe | RegexVault — Localization > Postal Codes

import re

spanish_cdigo_postal_pattern = re.compile(r'^(0[1-9]|[1-4][0-9]|5[0-2])[0-9]{3}$')

def validate_spanish_cdigo_postal(value: str) -> bool:
    return bool(spanish_cdigo_postal_pattern.fullmatch(value))

# Example
print(validate_spanish_cdigo_postal("28001"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Postal Codes 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

Spanish province codes 01-52. Madrid is 28, Barcelona is 08. Ceuta is 51, Melilla is 52. The Canary Islands (Gran Canaria 35, Tenerife 38) are Spanish territory.