mochajs / mocha / 5517

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Fix regexp in utils.stackTraceFilter to prevent ReDoS #3416 (#3686)

When the stacktrace begins with a large `Error.message` (single or multi line), Mocha's stack prettifier method (enabled by default) takes a long time to finish due to its regular expression. Certain assertions (e.g., `contains`, `deeplyEqual`) against large objects can trigger this problem.
This PR alters the RegExp to skip over the error message portion of the stacktrace.

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