求帮忙java正则匹配

Question

java 正则java

Answer 1

?pageNo=数字: \\\\?pageNo=\\d+
&pageNo=数字: &?pageNo=\\d+

Answer 2

System.out.println("?pageNo=43".matches("\\?pageNo=\\d+"));
System.out.println("?pageNo=tom".matches("\\?pageNo=\\d+"));
System.out.println("&pageNo=89".matches("&pageNo=\\d+"));

Answer 3

其实本意是想把"?或&pageNo=43"给替换为“”，怎么匹配 ？ String url ="xxx.action?pageNo=43&a=1&b=2"; 
或者
String url ="xxx.action?a=1&b=2&pageNo=43&";  System.out.println(url.replaceAll("\\?pageNo=\\d+", ""));

Answer 4

这个？  String url ="xxx.action?pageNo=43&a=1&b=2"; 
 String url2 ="xxx.action?a=1&b=2&pageNo=43&"; 
  System.out.println(url.replaceAll("[?&]pageNo=\\d+", ""));
  System.out.println(url2.replaceAll("[?&]pageNo=\\d+", ""));