HashiCorp Vault Token Regex for Python

What this pattern does

This page provides a well-structured, multi-part regular expression for matching hashicorp vault token, ported and verified for Python. In security-sensitive code, using an unverified regex can open the door to both false positives and denial-of-service attacks. 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

# HashiCorp Vault Token
# ReDoS-safe | RegexVault — Security > Secrets & Config

import re

hashicorp_vault_token_pattern = re.compile(r'^(?:hvs\.|s\.)[A-Za-z0-9]{20,200}$')

def validate_hashicorp_vault_token(value: str) -> bool:
    return bool(hashicorp_vault_token_pattern.fullmatch(value))

# Example
print(validate_hashicorp_vault_token("hvs.CAESILdJHHVdRKmXpGGNVRpzuIMz8NuNEMFWMJ0ZjUVNxWqp"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Security > Secrets & Config 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

Vault tokens: older format uses s. prefix; newer (Vault 1.10+) uses hvs. for service tokens, hvb. for batch tokens, hvr. for recovery tokens. Tokens expire based on TTL and are linked to specific Vault policies. Revoke via vault token revoke if exposed.