React.js currency input component

<!DOCTYPE html>
<html>

  <head>
    <script src="http://cdnjs.cloudflare.com/ajax/libs/react/0.13.3/react.js" data-semver="0.13.3" data-require="react@*"></script>
  </head>

  <body>
    <div id="example"></div>
    <script src="CurrencyField.js"></script>
    <script src="script.js"></script>
  </body>

</html>

var App = React.createClass({
  getInitialState: function() {
    return {money: '$1,000.3'};
  },
  handleChange: function(value) {
    this.setState({money: value});
  },
  render: function() {
    return (
      <div>
        <CurrencyField value={this.state.money} onChange={this.handleChange} />
        <div>{this.state.money}</div>
      </div> 
    );
  }
});


React.render(
  <App />,
  document.getElementById('example')
);

var CurrencyField = React.createClass({
  componentWillMount: function () {
    var value = this.convertToCurrency(this.props.value);
    // format
    this.props.value = new String(parseFloat(value).toFixed(2));
    // notify that value changed
    this.props.onChange(this.props.value);
  },
  render: function () {
    return <input type="text" value={this.props.value} onChange={this.handleChange} />;
  },
  handleChange: function (event) {
    this.convertToCurrency(event.target.value);
    // notify that value changed
    this.props.onChange(value);
  },
  convertToCurrency: function (input) {
    value = new String(input);
    // remove all characters that aren't digit or dot
    value = value.replace(/[^0-9.]/g,'');
    // replace multiple dots with a single dot
    value = value.replace(/\.+/g,'.');
    // only allow 2 digits after a dot
    value = value.replace(/(.*\.[0-9][0-9]?).*/g,'$1');
    // replace multiple zeros with a single one
    value = value.replace(/^0+(.*)$/,'0$1');
    // remove leading zero
    value = value.replace(/^0([^.].*)$/,'$1');
    return value;
  }
});