Java 中的 Matcher end(int)方法，示例
原文:https://www . geesforgeks . org/matcher-endint-method-in-Java-with-examples/
匹配器类的结束(int group) 方法用于从指定的组中获取已经完成的匹配结果的结束索引之后的偏移量。
语法:
public int end(int group)
参数:该方法取一个参数组，需要匹配图案结束索引后的偏移量。
返回值:该方法返回指定组匹配结束索引后的偏移量。
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。
- 如果给定组的模式中没有捕获组，则IndexOutOfBoundsException。
以下示例说明了 Matcher.end()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 = "(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 last index of match result
System.out.println(matcher.end(1));
}
}
}
Output:
current Matcher:Java . util . regex . Matcher[pattern =(G * s)region = 0，13 lastmatch=] 5 13
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 = "(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 last index of match result
System.out.println(matcher.end(0));
}
}
}
Output:
当前匹配器:Java . util . regex . Matcher[pattern =(G * G)region = 0，11 last match =] 1 3 6 9 11
参考: 甲骨文文档
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