FURB167: change example to re.search with ^ anchor

[hugovk]

Summary

The example for FURB167 has re.match with an ^ anchor to match the start of the string:

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

But re.match already implicitly matches the start of the string:

https://docs.python.org/3/library/re.html#search-vs-match

Let's change the example to re.search so the anchor isn't redundant. (The anchor's actually irrelevant to the example for this rule about long or short flag names.)

(Aside: There's a discussion about adding re.prefixmatch and [soft] deprecating re.match because of the confusion around it: https://discuss.python.org/t/add-re-prefixmatch-deprecate-re-match/105927, python/cpython#86519, python/cpython#31137.)

Test Plan

1. Create feature branch
2. Push to my fork to run CI
3. Realise feature branches are disabled for forks in Ruff CI
4. Merge feature branch to my main
5. Push that
6. Be happy I did, because it failed because I missed something
7. Fixup, pushup
8. Passes 🎉

[astral-sh-bot]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[henryiii]

By the way, if performance is critical, I believe match (without a redundant anchor) is just a hair faster.

[ntBre]

Thank you!