Replace every character from a DOM node with desired character

replace_every_char.jquery.js

function replaceEveryCharOf( selector, withChar, ignoreSpace ) {
  $(selector).contents().filter(function() {
    return this.nodeType == 3;
  }).each(function(){
    var regex = ignoreSpace ? /[^\s.]/g : /./g;
    this.textContent = this.textContent.replace(regex, withChar);
  });
}

// Usage:

replaceEveryCharOf($('*'), '■', true);