extensions/markdown-language-features/src/languageFeatures/pathCompletions.ts/MdVsCodePathCompletionProvider/getAnchorContext
class MdVsCodePathCompletionProvider:	private getAnchorContext(prefix: string): AnchorContext | undefined {
		const anchorMatch = prefix.match(/^(.*)#([\w\d\-]*)$/);
		if (!anchorMatch) {
			return undefined;
		}
		return {
			beforeAnchor: anchorMatch[1],
			anchorPrefix: anchorMatch[2],
		};
	}