perf: improve multilineCommentsRE regex (fix #10689)

[mrkldshv]

Description

Update multilineCommentsRE regular expression to more performant without lazy modifier.
Regex is based on https://stackoverflow.com/a/36328890.

Close #10689.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[bluwy]

Wait I didn't realize the mac CI is constantly failing 😅 looks like it's a lot more flaky recently.