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[lib] Use RegExp.source instead of RegExp.toString() in emojis.js
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Authored by ashoat on Jun 7 2023, 12:32 PM.
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Details

Summary

RegExp.toString() returns a string that includes / at the start and /g at the end, which forces us to parse the resultant string. We do this currently with another RegExp.

However, RegExp.source doesn't include those things. By using this property we can skip the parsing step.

Depends on D8145

Test Plan

Unit tests and comparing the generated RegExp object before and after the change to make sure they match (in Chrome debugger)

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