[Webkit-unassigned] [Bug 216671] New: Regex: optional start of string assertion fails

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216671

            Bug ID: 216671
           Summary: Regex: optional start of string assertion fails
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jridgewell at google.com

Re: https://github.com/Polymer/lit-html/pull/1218#discussion_r489158205

We've discovered that Safari's regex engine fails to match optional start of string position assertions, eg `/(^a)?B/`.

```js
const cases = [
  'aB',
  'bB',
  'B',
];

for (const s of cases) {
  if (!/(^a)?B/.test(s)) {
    throw new Error(s);
  }
}
```

Open your console on https://output.jsbin.com/finowid/1/quiet to see it run.

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