Java Matcher useAnchoringBounds(boolean)用法及代碼示例

Matcher類的useAnchoringBounds(boolean)方法用於設置此匹配器的錨定範圍。通過錨定邊界，這意味著如果錨定邊界設置為true，則匹配器將匹配^和$之類的錨以獲取匹配項。此方法返回具有修改後的錨定邊界的Matcher。

用法:

public boolean useAnchoringBounds(
               boolean setAnchoringBounds)

參數：此方法采用參數setAnchoringBounds，這是一個布爾值，描述了要修改為的此匹配器的錨定邊界。

返回值：此方法返回具有修改後的錨定邊界的Matcher。

下麵的示例說明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()); 
    } 
}

輸出：

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()); 
    } 
}

輸出：

Does this matcher has anchoring bounds: false

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

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注：本文由純淨天空篩選整理自Kirti_Mangal大神的英文原創作品 Matcher useAnchoringBounds(boolean) method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。