Java 中的 Matcher groupCount() 方法(帶示例)
java.util.regex.Matcher 類表示執行各種匹配操作的引擎。此類沒有建構函式,你可以使用 java.util.regex.Pattern 類的 matches() 方法建立/獲取此類的物件。
這個 (Matcher) 類的方法 groupCount() 計算當前匹配中的捕獲組的數量。
示例 1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class GroupTest {
public static void main(String[] args) {
String regex = "(.*)(\d+)(.*)";
String input = "This is a sample Text, 1234, with numbers in between.";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("First group match: "+matcher.group(1));
System.out.println("Second group match: "+matcher.group(2));
System.out.println("Third group match: "+matcher.group(3));
System.out.println("Number of groups capturing: "+matcher.groupCount());
}
}
}輸出
First group match: This is a sample Text, 123 Second group match: 4 Third group match: , with numbers in between. Number of groups: 3
示例 2
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test {
public static void main(String[] args) {
String str1 = "<p>This <b>is</b> an <b>example</b>HTML <b>script</b> where <b>ever</b> alternative <b>word</b> is <b>bold</b></p>.";
//Regular expression to match contents of the bold tags
String regex = "(t(\S+)t)(\s)";
String str = "the words tit tat tweet tostff tact that tilt text start and end wit the letter t ";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(str);
while (matcher.find()) {
System.out.println(matcher.group(0));
}
System.out.println("Total capturing groups: "+matcher.groupCount());
}
}輸出
tit tat tweet tact that tilt text tart Total capturing groups: 3
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