Singapore Postal Code Regex for Python

What this pattern does

This page provides a well-structured, multi-part regular expression for matching singapore postal code, 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

# Singapore Postal Code
# ReDoS-safe | RegexVault — Localization > Postal Codes

import re

singapore_postal_code_pattern = re.compile(r'^(0[1-9]|[1-7][0-9]|8[0-2])[0-9]{4}$')

def validate_singapore_postal_code(value: str) -> bool:
    return bool(singapore_postal_code_pattern.fullmatch(value))

# Example
print(validate_singapore_postal_code("018956"))  # 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

Singapore postal sectors run 01-82. The first two digits identify the area: 01-08 (Central), 09-11 (Orchard), 57-58 (Yishun), etc. Singapore has a geographically compact but dense postal grid.