Bug 294072 – Web Inspector: Broken Sources and Network tabs after creating Local Override with invalid Regular Expression

• Status: RESOLVED
• Resolution: FIXED
• Component: Web Inspector

[Razvan Caliman]

Created attachment 475487 [details]
Screenshot of the Local Override popover with the state that creates the bug

Originally reported by a developer on https://developer.apple.com/forums/thread/772801

An unhandled exception is thrown when attempting to use a URL pattern for a Local Override that turns out to be an invalid regular expression.

Steps to reproduce:
- Open the Source tab
- Create a new Local Override with this URL: (? 
- Mark it as a Regular Expression 
- Close the Local Override popover and reload the page

Result:
Web Inspector enters an unrecoverable state for non-debug builds where the unhandled exception is triggered for every requested URL. This leaves the UI in an unusable state for Sources and Network tabs.

Since Local Overrides are persisted and re-applied on every Web Inspector session, this impacts all inspected pages.

Uncaught Exceptions:
-----------------------
 - SyntaxError: Invalid regular expression: unrecognized character after (? (at LocalResourceOverride.js:349:26)
    RegExp @ [native code]
    _urlRegex @ LocalResourceOverride.js:349:26
    matches @ LocalResourceOverride.js:316:24
    filter @ [native code]
    localResourceOverridesForURL @ NetworkManager.js:470:20
    _updateContent @ LocalResourceOverrideWarningView.js:82:84
    initialLayout @ LocalResourceOverrideWarningView.js:72:28
    _layoutSubtree @ View.js:287:31
    _visitViewTreeForLayout @ View.js:383:36
-----------------------

[Radar WebKit Bug Importer]

<rdar://problem/152651800>

[Razvan Caliman]

Pull request: https://github.com/WebKit/WebKit/pull/46368

[EWS]

Committed 295928@main (1d01240dc083): <https://commits.webkit.org/295928@main>

Reviewed commits have been landed. Closing PR #46368 and removing active labels.

[EWS]

Committed 289651.570@safari-7621-branch (d5dc9856f363): <https://commits.webkit.org/289651.570@safari-7621-branch>

Reviewed commits have been landed. Closing PR #3153 and removing active labels.