IBAN (Germany — DE) Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching iban (germany — de), ported and verified for Python. Financial data validation has zero tolerance for false negatives — a missed invalid entry can corrupt downstream calculations. 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

# IBAN (Germany — DE)
# ReDoS-safe | RegexVault — Finance > Bank Identifiers

import re

iban_germany_de_pattern = re.compile(r'^DE[0-9]{20}$')

def validate_iban_germany_de(value: str) -> bool:
    return bool(iban_germany_de_pattern.fullmatch(value))

# Example
print(validate_iban_germany_de("DE89370400440532013000"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Bank Identifiers 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

German IBANs are always 22 characters (DE + 20 digits). The BLZ (Bankleitzahl) is the 8-digit bank routing code. Account numbers are right-padded with zeros to 10 digits.