Make identifier regular expression configurable

[itrapashko]

There are several places in the code where a regular expression is used to find identifiers in JavaScript code. As mentioned in the comment, this is a very approximate regular expression because it only considers Latin characters. As a result, if the code contains non-Latin identifiers, some debugger features do not work correctly.

Here is one example:

vscode-js-debug/src/common/sourceMaps/renameScopeAndSourceMap.ts

Lines 15 to 16 in a72801b

	/** Very approximate regex for JS identifiers */
	const identifierRe = /[$a-z_][$0-9A-Z_$]*/iy;

vscode-js-debug/src/common/sourceMaps/renameScopeAndSourceMap.ts

Line 47 in a72801b

const match = identifierRe.exec(source);

Here, the regular expression is used to construct variable renames based on source maps. In my scenario, the generated JavaScript code contains non-Latin identifiers, so the renaming does not work and the Variables view displays the names from the generated code instead. This makes debugging inconvenient because the variable names in the source code do not match the names shown in the Variables view.

A possible solution would be to make the identifier regular expression configurable. An identifierRegex field could be added to IBaseConfiguration. If specified, it would be used instead of the default regular expression. This would allow users to provide a more appropriate regular expression.

[connor4312]

Feel free to PR improvements to the regex