wanting a javascript regex notation for replacing cases

Question

e.g.

I want to write a camelToSnake()

camelToSnake = (phrase) ->
  return phrase.replace(/([A-Z])/g, /-\L$1/)

is there such options

Answer 1

You can use this code:

var s = 'camelToSnake';
var r = s.replace(/([A-Za-z])/g, function ($0, $1) { c=$1.charAt(0);
          return (c==c.toUpperCase())?c.toLowerCase():c.toUpperCase(); } );
//=> CAMELtOsNAKE