在另一个Match Java正则表达式中查找匹配项
要在另一个匹配项中匹配模式，您需要编译正则表达式以匹配外部模式，找到匹配项以检索结果并将结果作为输入传递给内部Matcher对象。
示例
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherExample {
public static void main(String[] args) {
int start = 0, len = -1;
Scanner sc = new Scanner(System.in);
System.out.println("Enter input text: ");
String input = sc.nextLine();
String regexOuter = "<b>(.*?)</b>";
String regexInner = "\\d+";
//创建一个模式对象
Pattern patternOuter = Pattern.compile(regexOuter);
Pattern patternInner = Pattern.compile(regexInner);
//匹配字符串中的已编译模式
Matcher outerMatcher = patternOuter.matcher(input);
while (outerMatcher.find()) {
Matcher innerMatcher = patternInner.matcher(outerMatcher.group(1));
while(innerMatcher.find()){
System.out.println(innerMatcher.group());
}
}
}
}输出结果
Enter input text: This is sample HTML data 123 sample text hello 123