int groupCount()
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小牛编辑
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2023-12-01
描述 (Description)
java.time.MatchResult.groupCount()方法返回此匹配结果模式中的捕获组数。
声明 (Declaration)
以下是java.time.MatchResult.groupCount()方法的声明。
int groupCount()
返回值 (Return Value)
此匹配器模式中的捕获组数。
例子 (Example)
以下示例显示了java.time.MatchResult.groupCount()方法的用法。
package cn.xnip;
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.