Split a string by whitespace, keeping quoted segments, allowing escaped quotes

You can change your regex to:

keywords = keywords.match(/\w+|"(?:\\"|[^"])+"/g);

Instead of [^"]+ you’ve got (?:\\"|[^"])+ which allows \" or other character, but not an unescaped quote.

One important note is that if you want the string to include a literal slash, it should be:

keywords="pop rock "hard rock" "\\"dream\\" pop""; //note the escaped slashes.

Also, there’s a slight inconsistency between \w+ and [^"]+ – for example, it will match the word "ab*d", but not ab*d (without quotes). Consider using [^"\s]+ instead, that will match non-spaces.

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