javascript - snake to camel

source code

<textarea id="a" rows="10"></textarea>
<input type="button" onclick="go()" value="==>">
<textarea id="b" rows="10"></textarea>
<script>
function go() {
  var val = document.getElementById("a").value;  
  document.getElementById("b").value = snakeToCamel(val);
}
function snakeToCamel(source) {
  var val = source;
    var result = source.match(/\w*(\w\_\w)+\w*/g);
  if (result != null) {
    for ( var i = 0; i < result.length; i++) {
      var word = result[i].toLowerCase();
      var arrUnderbar = word.match(/\_[a-zA-Z]/g);
      for ( var j = 0; j < arrUnderbar.length; j++) {
        word = word.replace(arrUnderbar[j], arrUnderbar[j]
            .toUpperCase().replace("_", ""));
      }
      val = val.replace(result[i], word);
    }    
  }
  return val;
}
</script>