//【全为英文】返回true 否则false
boolean result1 = str.matches("[a-zA-Z]+");
//【全为数字】返回true
Boolean result6 = str.matches("[0-9]+");
//【除英文和数字外无其他字符(只有英文数字的字符串)】返回true 否则false
boolean result2 = str.matches("[a-zA-Z0-9]+");
//【含有英文】true
String regex1 = ".*[a-zA-z].*";
boolean result3 = str.matches(regex1);
//【含有数字】true
String regex2 = ".*[0-9].*";
boolean result4 = str.matches(regex2);
//判断是否为纯中文,不是返回false
String regex3 = "[\\u4e00-\\u9fa5]+";
boolean result5 = str.matches(regex3);
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