933308 - PJS: Support regular expressions for parallel execution

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Niko Matsakis [:nmatsakis]]

In principle, regular expressions should be parallelizable. In practice, it is unknown if Yarr produces thread-safe code and what other obstacles we may encounter.

Note that we have to be careful about regular expressions that use the `g` option, as that will cause the regular expression object itself to be mutated, which would not be threadsafe. This might be an area where it is worth approaching TC39 with alternate APIs that are more amenable to thread-safe execution.