There are two things that are tripping you up. The first is the greediness of [^"'/]+. The part of the regex that matches a regular expression looks for an equal sign or left paren followed by a slash; unfortunately, the equal sign or left paren has already been gobbled up! You could fix this by adding = and ( to the character class. On the other hand, since you're substituting in place, you don't even need that part of the regex. Just remove [^"'/]+ | and it should work fine.

The other problem is this curious regex in the JS: mystring.match(/[/\\*?"<>\:~|]/gi);. That regex would not be valid in Perl, because it contains an unescaped forward slash. Is it really valid in JavaScript? If so, you'll need to extend your regex so that it allows unescaped slashes within square brackets.