Markdown extension fails in Safari: "Invalid regular expression: invalid group specifier name."

[jrieken]

• run yarn web
• open http://localhost:8080 and then file.md
• 💥 the extension doesn't activate

[mjbvz]

@meganrogge I tracked this down to this regular expression:

vscode/extensions/markdown-language-features/src/features/smartSelect.ts

Line 165 in a2193cb

const regex = /(?:^|(?<=\s))(?:\*\*\s*([^*]+)(?:\*\s*([^*]+)\s*?\*)*([^*]+)\s*?\*\*)/g;

The createOtherInlineRange regex may be invalid too. Not