本文展示了一个使用Java进行IP地址验证的例子。通过正则表达式解析并分组IP地址的各个部分，此代码片段有助于理解如何利用Pattern和Matcher类进行精确匹配。
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Group {
public static void main(String[] args) {
String ip = "192.168.1.1";
String reg = "(\\d{1,3}).(\\d{1,3}).(\\d{1,3}).(\\d{1,3})";
Pattern pattern = Pattern.compile(reg);
Matcher matcher = pattern.matcher(ip);
if(matcher.find()) {
System.out.println(matcher.group(1));
System.out.println(matcher.group(2));
System.out.println(matcher.group(3));
System.out.println(matcher.group(4));
}
}
}
import java.util.regex.Pattern;
public class Group {
public static void main(String[] args) {
String ip = "192.168.1.1";
String reg = "(\\d{1,3}).(\\d{1,3}).(\\d{1,3}).(\\d{1,3})";
Pattern pattern = Pattern.compile(reg);
Matcher matcher = pattern.matcher(ip);
if(matcher.find()) {
System.out.println(matcher.group(1));
System.out.println(matcher.group(2));
System.out.println(matcher.group(3));
System.out.println(matcher.group(4));
}
}
}
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