Java 中 MatchResult group()方法，带示例
原文:https://www . geesforgeks . org/match result-group-method-in-Java-with-examples/
使用匹配结果界面的组()方法获取与前一个匹配结果匹配的输入子序列。 语法:
public String group()
参数:该方法不取任何参数。 返回值:该方法返回字符串，该字符串是上一次匹配的输入子序列。 异常:如果还没有尝试匹配，或者之前的匹配操作失败，这个方法抛出illegalstatexception。 以下示例说明了 MatchResult.group()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 group() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "(G*s)";
// 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 current matcher state
MatchResult result
= matcher.toMatchResult();
System.out.println("Current Matcher: "
+ result);
while (matcher.find()) {
// Get the group matched using group() method
System.out.println(matcher.group());
}
}
}
Output: Current Matcher: java.util.regex.Matcher[pattern=(G*s) region=0,13 lastmatch=] s s
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java code to illustrate group() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "(G*G)";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GFG FGF GFG";
// Create a matcher for the input String
Matcher matcher
= pattern
.matcher(stringToBeMatched);
// Get the current matcher state
MatchResult result
= matcher.toMatchResult();
System.out.println("Current Matcher: "
+ result);
while (matcher.find()) {
// Get the group matched using group() method
System.out.println(matcher.group());
}
}
}
Output: Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0,11 lastmatch=] G G G G G
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