ustring/src/separate.js

'use strict'

var doubleColonRe      = /::/g
var upperToLowerRe     = /([A-Z]+)([A-Z][a-z])/g
var lowerToUpperRe     = /([a-z\d])([A-Z])/g
var underscoreToDashRe = /_/g

module.exports = function(name, separator){

   return name?
           name.replace(doubleColonRe, '/')
                .replace(upperToLowerRe, '$1_$2')
                .replace(lowerToUpperRe, '$1_$2')
                .replace(underscoreToDashRe, separator || '-')
            :
            ''
}