Question

java中怎么用正则表达式截取字符串

Answer 1

public static void main(String[]agrs){
String s = "{\"internal_1\": [{\"version\": 4,\"addr\": \"192.160.1.11\"}]}";
String regex = ".+?\\[(.+?)\\].+?";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(s);
if (matcher.matches()) {
String group = matcher.group(1);
System.out.println(group);
}else {
System.out.println("no matches!!");
}
}

正则表达式：.+?\\[(.+?)\\].+?
结果：{"version": 4,"addr": "192.160.1.11"}

Answer 2

substring(),百度一下有很多现成的方法