Fix legacy label regex

[koesie10]

When the legacyLabelRegex is tested multiple times against the same string (as happens most of the time, unless a user-specified label is added), it would start searching from the end of the previous match instead of from the start of the string:

“JavaScript RegExp objects are stateful when they have the global or sticky flags set (e.g., /foo/g or /foo/y). They store a lastIndex from the previous match. Using this internally, test() can be used to iterate over multiple matches in a string of text (with capture groups).”

This fixes it by resetting lastIndex before running the test method.

[Copilot]

Pull Request Overview

This PR fixes a bug with the legacyLabelRegex by resetting its lastIndex before running test(), ensuring that the regex always starts searching from the beginning of the string.

• Resets lastIndex on legacyLabelRegex to prevent stateful matching issues
• Ensures legacy labels are processed correctly when used repeatedly

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[starcke]

👍 Nice find!