匹配所有空格的正则表达式，除了？

Question

Regex that matches all spaces but:

1. \\sand\\s
2. \\sor\\s
3. \\sbut\\s
4. ,\\s
   
   
   

Input

font weight, width and height, background, or background color, but transform style

input.replace(regex,"-")

Matches

fontweight, width and height, background, or backgroundcolor, but transformstyle

Replace

font - weight, width and height, background, or background - color, but transform - style


Output

font-weight, width and height, background, or background-color, but transform-style

Answer 1

Since JavaScript doesn't support look behinds, you won't find a regex which will be able to do it as simply as the replace as you have there. If you are willing to extend the replace logic a bit, you can use an answer such as the following (adapted from answer here: Regex negative lookbehind not valid in JavaScript )

 var input = " font weight, bland food, width and height, background, or background color, but transform style, and background repeat" var regex = /\\b(\\s?and|\\s?but|\\s?or|,)?\\s/g var output = input.replace(regex, function($0, $1) { return ($1 ? $0 : "-") }); console.log(output);