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regex-flag-alias (FURB167)#

Derived from the refurb linter.

Fix is always available.

This rule is unstable and in preview. The --preview flag is required for use.

What it does#

Checks for the use of shorthand aliases for regular expression flags (e.g., re.I instead of re.IGNORECASE).

Why is this bad?#

The regular expression module provides descriptive names for each flag, along with single-letter aliases. Prefer the descriptive names, as they are more readable and self-documenting.


import re

if re.match("^hello", "hello world", re.I):

Use instead:

import re

if re.match("^hello", "hello world", re.IGNORECASE):