Java 中的 MatchResult groupCount()方法，带示例
原文:https://www . geesforgeks . org/match result-group count-method-in-Java-with-examples/
匹配结果界面的组计数()方法用于获取该匹配器模式中的捕获组数量。此方法返回一个整数值，它是匹配此匹配器时找到的组数。 语法:
public int groupCount()
参数:该方法不取任何参数。 返回值:该方法返回该匹配器模式下的捕获组数。 以下示例说明了 MatchResult.groupCount()方法: 示例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// 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 Geeks for For Geeks Geek";
// Create a matcher for the input String
MatchResult matcher
= pattern
.matcher(stringToBeMatched);
// Get the number of capturing groups
// using groupCount() method
System.out.println(matcher.groupCount());
}
}
Output:
1
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// 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
= "FGF GF FG FGF";
// Create a matcher for the input String
MatchResult matcher
= pattern
.matcher(stringToBeMatched);
// Get the number of capturing groups
// using groupCount() method
System.out.println(matcher.groupCount());
}
}
Output:
0
参考:https://docs . Oracle . com/javase/9/docs/API/Java/util/regex/matcher . html # group count–
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