Why doesn't this regular expression work in Notepad ++ (Windows)?

Question

The following regex works when I test it here: https://regex101.com/r/oxsNRW/2

(toString\(\)[\s\S]+\))(\s*\R\s*?})

However, when I put the same input and regular expression in Notepad ++ on Windows 10, it says that the regular expression is not valid. Why?

Answer 1

The source code is Notepad ++ regex Boost , and its regex syntax is slightly different from PCRE.

In your case, remove }:

(toString\(\)[\s\S]+\))(\s*\R\s*\})
                                ^^