正则表达式匹配“大写字母，小写字母，数字，特殊字符”四项中的至少三项

匹配“大写字母，小写字母，数字，特殊字符”四项中的至少三项的正则表达式如下：

“^(?![a-zA-Z]+$)(?![A-Z0-9]+$)(?![A-Z\W_!@#$%^&*`~()-+=]+$)(?![a-z0-9]+$)(?![a-z\W_!@#$%^&*`~()-+=]+$)(?![0-9\W_!@#$%^&*`~()-+=]+$)[a-zA-Z0-9\W_!@#$%^&*`~()-+=]{8,30}$”

正则代码生成网站：

http://tool.chinaz.com/tools/regexgenerate

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexMatches {

public static void main(String args[]) {
String str = "";
String pattern = "^(?![a-zA-Z]+$)(?![A-Z0-9]+$)(?![A-Z\W_!@#$%^&*`~()-+=]+$)(?![a-z0-9]+$)(?![a-z\W_!@#$%^&*`~()-+=]+$)(?![0-9\W_!@#$%^&*`~()-+=]+$)[a-zA-Z0-9\W_!@#$%^&*`~()-+=]{6,30}$";

Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(str);
System.out.println(m.matches());
}
}