Matcher Class的groupCount()方法用于获取此Matcher模式中的捕获组数。
用法:
public int groupCount()
参数:此方法不带任何参数。
返回值:此方法返回此匹配器模式中的捕获组数。
下面的示例说明Matcher.groupCount()方法:
示例1:
// Java code to illustrate groupCount() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "Geeks";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GeeksForGeeks";
// Create a matcher for the input String
Matcher matcher
= pattern
.matcher(stringToBeMatched);
// Get the number of capturing groups
// using groupCount() method
System.out.println(matcher.groupCount());
}
}
输出:
0
示例2:
// Java code to illustrate groupCount() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "GFG";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GFGFGFGFGFGFGFGFGFG";
// Create a matcher for the input String
Matcher matcher
= pattern
.matcher(stringToBeMatched);
// Get the number of capturing groups
// using groupCount() method
System.out.println(matcher.groupCount());
}
}
输出:
0
参考: Oracle Doc
相关用法
- Java MatchResult groupCount()用法及代码示例
- Java Matcher end(int)用法及代码示例
- Java Matcher end()用法及代码示例
- Java Matcher group(int)用法及代码示例
- Java Matcher lookingAt()用法及代码示例
- Java Matcher find(int)用法及代码示例
- Java Matcher reset()用法及代码示例
- Java Matcher matches()用法及代码示例
- Java Matcher start()用法及代码示例
- Java Matcher start(int)用法及代码示例
- Java Matcher pattern()用法及代码示例
- Java Matcher group()用法及代码示例
- Java Matcher toMatchResult()用法及代码示例
- Java Matcher find()用法及代码示例
- Java Matcher hasTransparentBounds()用法及代码示例
注:本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 Matcher groupCount() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。