Unicode Script Code (ISO 15924) Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching unicode script code (iso 15924), 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

# Unicode Script Code (ISO 15924)
# ReDoS-safe | RegexVault — Localization > Locale & Language

import re

unicode_script_code_iso_15924_pattern = re.compile(r'^[A-Z][a-z]{3}$')

def validate_unicode_script_code_iso_15924(value: str) -> bool:
    return bool(unicode_script_code_iso_15924_pattern.fullmatch(value))

# Example
print(validate_unicode_script_code_iso_15924("Latn"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Locale & Language 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

ISO 15924 script codes: Latn=Latin, Hans=Simplified Chinese, Hant=Traditional Chinese, Arab=Arabic, Cyrl=Cyrillic, Deva=Devanagari (Hindi), Hang=Hangul, Jpan=Japanese (Han+Hiragana+Katakana). Used in BCP 47 language tags.