AWS EventBridge Rate Expression Regex for Python

What this pattern does

This page provides a well-structured, multi-part regular expression for matching aws eventbridge rate expression, 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

# AWS EventBridge Rate Expression
# ReDoS-safe | RegexVault — Dev & Systems > Cron

import re

aws_eventbridge_rate_expression_pattern = re.compile(r'^rate\((?:1 (minute|hour|day)|[2-9][0-9]* (minutes|hours|days))\)$')

def validate_aws_eventbridge_rate_expression(value: str) -> bool:
    return bool(aws_eventbridge_rate_expression_pattern.fullmatch(value))

# Example
print(validate_aws_eventbridge_rate_expression("rate(1 minute)"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Dev & Systems > Cron 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

AWS requires singular units (minute, hour, day) when the value is 1, and plural otherwise. Validate singular/plural agreement in application code. Capture group 1 = value, group 2 = unit.