fix: max attribute length with longer regex custom html tags

[oliverhaas]

Pull Request Check List

Resolves: #883

• [x] Added tests for changed code.
• [ ] Updated documentation for changed code. --> No, since it's just a bugfix

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[christopherpickering]

:tada: This PR is included in version 1.34.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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