regex - Javascript/jQuery: Split camelcase string and add hyphen rather than space



I would imagine this is a multiple part situation with regex, but how would you split a camelcase string at the capital letters turning them in to lowercase letters, and then adding a hyphen between each new string?

For example:


would become:


5 Answers: 

Try something like:

var myStr = 'thisString';

myStr = myStr.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase();

Late to answer, but this solution will work for cases where a single letter is camel cased.

'thisIsATest'.replace(/([a-zA-Z])(?=[A-Z])/g, '$1-').toLowerCase();  // this-is-a-test

Try the following:

var token = document.getElementsByTagName('strong')[0].innerHTML,
    replaced = token.replace(/[a-z][A-Z]/g, function(str, offset) {
       return str[0] + '-' + str[1].toLowerCase();


Example -

Documentation for the string replace function:

String.prototype.camelCaseToDashed = function(){
  return this.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase();
// Usage

I don't know why all these solutions are so complex but i simply found this to be enough:

function camelCaseToDash(input){ 
     // replace Capital letter with the letter + a dash: '-', then lowercase everything.
     return input.replace(/([A-Z])/g, '-$1').toLowerCase(); 

//or, using a callback function, directly lowercasing.
function camelCaseToDashCallback(input){
     //replace capital letter with lowercase variant + a dash '-'.
     return input.replace(/([A-Z])/g, (x)=> "-"+ x.toLowerCase());

generally option 1 is faster though: