java.util.regex.MatchResult.groupCount 方法
描述
java.time.MatchResult.groupCount() 方法返回此匹配结果模式中的groupCount数。
声明
以下是 java.time.MatchResult.groupCount() 方法的声明。
int groupCount()
返回值
此匹配器模式中的groupCount数。
示例
下面的例子展示了 java.time.MatchResult.groupCount() 方法的用法。
package com.tutorialspoint; import java.util.regex.MatchResult; import java.util.regex.Matcher; import java.util.regex.Pattern; public class MatchResultDemo { private static final String REGEX = "(.*)(\\d+)(.*)"; private static final String INPUT = "This is a sample Text, 1234, with numbers in between."; public static void main(String[] args) { // create a pattern Pattern pattern = Pattern.compile(REGEX); // get a matcher object Matcher matcher = pattern.matcher(INPUT); if(matcher.find()) { //get the MatchResult Object MatchResult result = matcher.toMatchResult(); //Prints the number of capturing groups in this match result's pattern. System.out.println("Capturing Groups: "+result.groupCount()); } } }
让我们编译并运行上面的程序,这将产生以下结果 −
First Capturing Group - Match String: This is a sample Text, 1234, with numbers in between.