Java Matcher useAnchoringBounds(boolean)用法及代码示例

Matcher类的useAnchoringBounds(boolean)方法用于设置此匹配器的锚定范围。通过锚定边界，这意味着如果锚定边界设置为true，则匹配器将匹配^和$之类的锚以获取匹配项。此方法返回具有修改后的锚定边界的Matcher。

用法:

public boolean useAnchoringBounds(
               boolean setAnchoringBounds)

参数：此方法采用参数setAnchoringBounds，这是一个布尔值，描述了要修改为的此匹配器的锚定边界。

返回值：此方法返回具有修改后的锚定边界的Matcher。

下面的示例说明Matcher.useAnchoringBounds()方法：

示例1:

// Java code to illustrate useAnchoringBounds() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(Geeks)"; 
  
        // Create a pattern from regex 
        Pattern pattern 
            = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "GeeksForGeeks Geeks for For Geeks Geek"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        // set the anchoring bounds to true 
        // using useAnchoringBounds() method 
        matcher = matcher 
                      .useAnchoringBounds(true); 
  
        // Check if this matcher has anchoring bounds or not 
        System.out.println("Does this matcher"
                           + " has anchoring bounds: "
                           + matcher.hasAnchoringBounds()); 
    } 
}

输出：

Does this matcher has anchoring bounds: true

示例2:

// Java code to illustrate useAnchoringBounds() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(FGF)"; 
  
        // Create a pattern from regex 
        Pattern pattern 
            = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "FGF GFG GFG FGF"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        // set the anchoring bounds to true 
        // using useAnchoringBounds() method 
        matcher = matcher 
                      .useAnchoringBounds(false); 
  
        // Check if this matcher has anchoring bounds or not 
        System.out.println("Does this matcher"
                           + " has anchoring bounds: "
                           + matcher.hasAnchoringBounds()); 
    } 
}

输出：

Does this matcher has anchoring bounds: false

参考： https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#useAnchoringBounds-boolean-

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注：本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 Matcher useAnchoringBounds(boolean) method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。