问reactjs中的密码验证

EN

class PasswordForm extends React.Component {
    constructor(props) {
        super(props);
        this.state = {value: ''};

        this.handleChange = this.handleChange.bind(this);
        this.handleSubmit = this.handleSubmit.bind(this);
    }

    handleChange(event) {
        this.setState({value: event.target.value});
    }

    validate(event) {
        var pass = event.target.value;
        var reg = '/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,32}$/';
        var test = reg.test(pass);
        if (test) {
            alert('pass');
        } else{
            alert('fail');
        }
    }

    handleSubmit(event) {
        if(this.state.value.length < 8) {
            return false;
        }

        alert('A password was submitted that was ' + this.state.value.length + '    characters long.');
        event.preventDefault();
    }

    render() {
        return (
            <form onSubmit={this.handleSubmit}>
                <label>
                    Password:&nbsp;
                    <input type="password" value={this.state.value} onChange={this.handleChange} onInput={this.validate}/>
                </label>
                <input type="submit" value="Submit" />
            </form>
        );
    }
}

ReactDOM.render(
    <PasswordForm />,
    document.getElementById('root')
);