正则表达式

• 数字

Pattern pattern = Pattern.compile("^[0-9]+$");

• 字母

Pattern pattern = Pattern.compile("^[a-zA-Z]+$");

• 汉字

 Pattern pattern = Pattern.compile("^[\\u4E00-\\u9FA5]+$");

• 汉字字母数字组合

 Pattern pattern = Pattern.compile("^[\\u4e00-\\u9fa5a-zA-Z0-9]+$");