Lookbehind assertion is not fixed length

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Description and Reproduction Steps

There is currently an outstanding issue with regards to github-linguist: github-linguist/linguist#3924

[ ] repository vendor/grammars/vscode-vba (from serkonda7/vscode-vba.git) (1 errors)

• Invalid regex in grammar: source.vba (in syntaxes/vba.yaml-tmlanguage) contains a malformed regex (regex "(?i:\b(?:(?<=(Call|Function|Sub)...": lookbehind assertion is not fixed length (at offset 33))

Current Behavior

The regex rule is using a "lookbehind assertion [that] is not fixed length".

Expected Behavior

We should rewrite the rule to avoid using lookbehind by using the "begin/beginCaptures" syntax.

Additional Information

No response

Environment details

NA