Fix: avoid using regex match, possibly containing alternation, as a key condition.

[yakov-olkhovskiy]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fixed bug of match() function (regex) with pattern containing alternation produces incorrect key condition.

closes #53222

[robot-ch-test-poll3]

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[rschu1ze]

I thought a bit

• whether the check should rather be moved into extractFixedPrefixFromRegularExpression() but I think it is okay to not do so
• whether extractFixedPrefixFromRegularExpression() could be replaced by the more sophisticated regex parsing in OptimizedRegularExpression::analyze(), but again no. ::analyze() searches the longest substring and that's not necessarily the prefix.

Therefore, we can merge the fix. Thanks.

[den-crane]

Strange that it's not backported into LTS releases but the issue was marked as major

[rschu1ze]

True. Let's backport it.