Price/Quote with Tick Size Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching price/quote with tick size, 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

# Price/Quote with Tick Size
# ReDoS-safe | RegexVault — Finance > Currency & Money

import re

pricequote_with_tick_size_pattern = re.compile(r'^[0-9]+(?:\.[0-9]{1,8})?$')

def validate_pricequote_with_tick_size(value: str) -> bool:
    return bool(pricequote_with_tick_size_pattern.fullmatch(value))

# Example
print(validate_pricequote_with_tick_size("1.2345"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Currency & Money 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

Up to 8 decimal places covers BTC satoshi precision (0.00000001 BTC = 1 satoshi). FX prices conventionally use 4-5 decimal places (pips). Equities use 2. Reject negative prices at application level.