Java 中的 Matcher 组(String)方法，示例
原文:https://www . geesforgeks . org/matcher-group string-in-Java-method-with-examples/
匹配器类的组(字符串)方法用于从指定的字符串中获取已经完成的匹配结果的组。
语法:
public String group(String string)
参数:该方法取一个参数字符串，即需要匹配模式的组索引的字符串。
返回值:该方法从指定字符串中返回匹配组的组。
异常:此方法抛出:
- 如果尚未尝试匹配，或者如果先前的匹配操作失败，则illegalstatexception。
- 如果给定名称的模式中没有捕获组，则indexout of BoundSexception。
下面的例子说明了 Matcher.group()方法:
例 1:
// Java code to illustrate end() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "\\b(?<Geeks>[A-Za-z\\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("Geeks"));
}
}
}
Output:
当前 Matcher:Java . util . regex . Matcher[pattern = \ b(？ [A-Za-z\s]+)区域=0，13 last match =] geeks forgeeks
例 2:
// Java code to illustrate end() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "\\b(?<GFG>[A-Za-z\\s]+)";
// 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("GFG"));
}
}
}
Output:
当前 Matcher:Java . util . regex . Matcher[pattern = \ b(？ [A-Za-z\s]+)区域=0，11 lastmatch=] GFG FGF GFG
参考: 甲骨文文档
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