https://onlinetools.com/unicode/escape-unicode
Escape Unicode – Online Unicode Tools
This utility escapes Unicode data. It's free, gets the job done quickly, and it's entirely browser-based. Try it out!
escape unicodeonlinetools
https://rdrr.io/cran/stringi/man/stri_escape_unicode.html
stri_escape_unicode: Escape Unicode Code Points in stringi: Fast and Portable Character String...
escape unicode
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Regex_invalid_unicode_escape
SyntaxError: invalid unicode escape in regular expression - JavaScript | MDN
The JavaScript exception "invalid unicode escape in regular expression" occurs when the \c and \u character escapes are not followed by valid characters.
unicode escaperegular expressionsyntaxerrorinvalidjavascript
https://www.base64.sh/sv/js-unicode/
JavaScript Unicode-escape | \uXXXX-kodare/avkodare
unicode escapejavascript