Java中的 Matcher requireEnd() 方法和示例

Matcher 类的requireEnd()方法用于检查锚点的任何组合是否导致匹配在末尾有界。这些锚可以是任何锚，例如单词锚或前瞻。此方法返回一个布尔值，说明相同。

句法：

public boolean requireEnd()

参数：此方法不带参数。

返回值：此方法返回一个布尔值，说明是否有任何锚点组合导致匹配在末尾有界。

下面的示例说明了 Matcher.requireEnd() 方法：

示例 1：

// Java code to illustrate requireEnd() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        // with an anchor
        String regex = "Geeks$";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GFG GFG GEEKS Geeks";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        matcher.find();
  
        // Check if a match has been found
        // using requireEnd() method
        System.out.println("Has any anchor "
                           + "bounded the search: "
                           + matcher.requireEnd());
    }
}

输出：

Has any anchor bounded the search: true

示例 2：

// Java code to illustrate requireEnd() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        // without any anchor
        String regex = "Geeks";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GFG GFG GEEKS Geeks";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        matcher.find();
  
        // Check if a match has been found
        // using requireEnd() method
        System.out.println("Has any anchor "
                           + "bounded the search: "
                           + matcher.requireEnd());
    }
}

输出：

Has any anchor bounded the search: false

参考： https://docs.oracle.com/javase/9/docs/api/ Java/util/regex/Matcher.html#requireEnd–