[Webkit-unassigned] [Bug 205477] New: Unicode Regex with Emojis corrupts string replacement

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205477

            Bug ID: 205477
           Summary: Unicode Regex with Emojis corrupts string replacement
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: schuyler at jewlr.com

Created attachment 386160

  --> https://bugs.webkit.org/attachment.cgi?id=386160&action=review

Reproduction example

Given a surrogate-pair emoji: https://emojipedia.org/blue-heart/

And a string containing it: foobar��

And a Regular Expression such as this:

const re = new RegExp('[^a-zA-Z��]', 'uig')

A replacement such as this on iOS:

"foobar��".replace(re, '')

Yields a corrupted string:

"foobar�"

It seems that the replacement only preserves the first half of the surrogate pair, even though the regular expression has the unicode flag enabled.

On MacOS Safari, the result is completely missing emojis.

On an alternative browser like Chrome, the result still contains the �� emoji. This reproduction case has been known to work before on Safari, but now no longer seems to be the case.

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