SyntaxError: Invalid regular expression: invalid group specifier name in Safari < 16.4

**Marked version:** 18.0.0 **Describe the bug** Very similar to #3816 - still experiencing an `invalid group specifier name` in Safari 15. The regex that is produced for blockSkip (I think as I can only test remotely on compiled code) ends up to be: ``` r = "\\[(?:[^\\[\\]`]|(?<a>`+)[^`]+\\k<a>(?!`))*?\\]\\((?:\\\\[\\s\\S]|[^\\\\\\(\\)]|\\((?:\\\\[\\s\\S]|[^\\\\\\(\\)])*\\))*\\)|(?<!`)()(?<b>`+)[^`]+\\k<b>(?!`)|<(?! )[^<>]*?>" ``` running the regex in safari 15 `new RegExp(r)`, produces the above error **To Reproduce** as above **Expected behavior** marked works with older version of Safari Thank you for this lib and the efforts maintaining it !