SEDOL Regex for Python

What this pattern does

This page provides a well-structured, multi-part regular expression for matching sedol, 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

# SEDOL
# ReDoS-safe | RegexVault — Finance > Securities & Trading

import re

sedol_pattern = re.compile(r'^[B-DF-HJ-NP-TV-Z0-9]{6}[0-9]$')

def validate_sedol(value: str) -> bool:
    return bool(sedol_pattern.fullmatch(value))

# Example
print(validate_sedol("0263494"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Securities & Trading 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

SEDOL is the UK equivalent of CUSIP. Since 2004, SEDOLs use alphanumeric characters (excluding vowels A, E, I, O, U). Older SEDOLs are 7 digits. Check digit uses a weighted sum mod 10.