[Critical] Page freezes with this raw text about markdown-to-jsx

[henrymcl]

This is typical ReDOS.

Removing the final \w from (?!\1|\w) will resolve the issue but likely there will be implications.

[quantizor]

While removing that bit does improve the emphasis detection regex performance (at the cost of an underscore in the middle of a word tripping the detector, which is its own whole debate), there seems to be another issue happening as well because the inline regex is reaching across table header cells where it should be isolated per cell. I think that's the first culprit worth exploring here...

[quantizor]

This should be fixed with the most recent version

[joehe00]

The chrome freeze issue still exist for the sting pasted above.