Java Matcher lookingAt()用法及代碼示例

Matcher類的lookingAt()方法嘗試在匹配器中部分或完全匹配模式。它返回一個布爾值，顯示從模式開始部分還是完全匹配該模式。

用法:

public boolean lookingAt()

參數：此方法不帶任何參數。

返回值：此方法返回一個布爾值，該布爾值顯示輸入序列的前綴是否與此匹配器的模式匹配。

下麵的示例說明Matcher.lookingAt()方法：

示例1:

// Java code to illustrate lookingAt() 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"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern 
                  .matcher(stringToBeMatched); 
  
        // Get the possible result 
        // using lookingAt() method 
        System.out.println(matcher.lookingAt()); 
    } 
}

輸出：

true

示例2:

// Java code to illustrate lookingAt() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "GFG"; 
  
        // Create a pattern from regex 
        Pattern pattern 
            = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "GFGFGFGFGFGFGFGFGFG"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern 
                  .matcher(stringToBeMatched); 
  
        // Get the possible result 
        // using lookingAt() method 
        System.out.println(matcher.lookingAt()); 
    } 
}

輸出：

true

參考： https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#lookingAt–

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