unraw-re-pattern (RUF039)

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

What it does

Reports the following re and regex calls when their first arguments are not raw strings:

• For regex and re: compile, findall, finditer, fullmatch, match, search, split, sub, subn.
• regex-specific: splititer, subf, subfn, template.

Why is this bad?

Regular expressions should be written using raw strings to avoid double escaping.

Example

re.compile("foo\\bar")

Use instead:

re.compile(r"foo\bar")