Java 中的 Matcher groupCount()方法，带示例
原文:https://www . geesforgeks . org/matcher-group count-method-in-Java-with-examples/
匹配器类的 groupCount() 方法用于获取该匹配器模式中的捕获组数。
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 Matcher.groupCount()方法:
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
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: 甲骨文文档
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