简单的正则表达式的使用

//文字做账号

//密码只能使用abAB1-4^

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.but2:
            if (!checkString(et1.getText().toString().trim())) {
                Toast.makeText(this, "账号格式不对", Toast.LENGTH_SHORT).show();
                return;
            }else if (!pwd(et2.getText().toString().trim())){
                Toast.makeText(this, "登录失败", Toast.LENGTH_SHORT).show();
                return;
            }
            Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();
            break;
    }
}

private boolean checkString(String s) {
    String regex = "([^\\x00-\\xff]{0,100})";
    Pattern p = Pattern.compile(regex);
    Matcher m = p.matcher(s);
    return m.matches();
}
private boolean pwd(String s) {
    String regex = "^[1-4aAbB^]+$";
    Pattern p = Pattern.compile(regex);
    Matcher m = p.matcher(s);
    return m.matches();
}