Fix JavaScript highlighting in Razor files after C# control structures without braces

[Copilot]

JavaScript in <script> blocks loses syntax highlighting when preceded by C# control structures without braces in Razor files. This occurs because the TextMate grammar pattern for control structures only ended after seeing a closing brace }, causing single-statement control structures to consume subsequent content.

Changes

• Modified control structure end patterns: Updated end condition from '(?<=})' to '(?<=})|(?<=;)|(?=^\s*\})' for all C# control structures (if, else, for, foreach, using, lock, do, switch, try, catch, finally)
• Added test coverage: Two new test cases verify JavaScript highlighting after control structures without braces

Example

Before (JavaScript not highlighted):

@{
    if (l == 1)
        Console.WriteLine("test");
}

<script>
$(document).on("ready", function() {
    console.log("not working");  // No highlighting
});
</script>

After (JavaScript properly highlighted):

@{
    if (l == 1)
        Console.WriteLine("test");
}

<script>
$(document).on("ready", function() {
    console.log("working");  // Full syntax highlighting
});
</script>

The pattern now terminates after semicolons (single statements) and before closing braces at line start (parent block boundaries), in addition to the existing behavior for control structure blocks.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>JavaScript coloring does not work in all .cshtml files</issue_title>
<issue_description>This issue has been moved from a ticket on Developer Community.

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[severity:It bothers me. A fix would be nice]
In some .cshtml files, JavaScript coloring does not work.

Examples:

Working

Not working

Both files are partial views. Checked code syntax - everything is good.
Tried re-opening file - nothing.
Tried solutions in this SO thread - nothing. (https://stackoverflow.com/questions/78189420/syntax-highlighting-visual-studio-2022-in-cshtml-files-not-working)

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Original Comments

Feedback Bot on 11/11/2025, 00:44 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Jonas Gucu on 11/12/2025, 05:12 AM:

After a bit of experimentation, it looks like sometimes C# code breaks the rest of the code.
In this case it’s an if statement not having curly braces.

Working example:

Not working example:

<agent_instructions>Please fix our textmate grammar so script blocks after C# if statements, without braces, are colored correctly.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes JavaScript coloring does not work in all .cshtml files #8864

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