Java Pattern flags()用法及代码示例

Java中Pattern类的flags()方法用于返回模式的匹配标志。匹配标志是一个位掩码，可以包括CASE_INSENSITIVE，MULTILINE，DOTALL，UNICODE_CASE，CANON_EQ，UNIX_LINES，LITERAL，UNICODE_CHARACTER_CLASS和COMMENTS标志。

用法:

public int flags()

参数：此方法不接受任何参数。

返回值：此方法返回模式的匹配标志。

以下示例程序旨在说明flags()方法：

示例1:

// Java program to demonstrate 
// Pattern.flags() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // create a REGEX String 
        String REGEX = "(.*)(for)(.*)?"; 
  
        // create the string 
        // in which you want to search 
        String actualString 
            = "code of Machine"; 
  
        // compile the regex to create pattern 
        // using compile() method 
        Pattern pattern = Pattern.compile(REGEX,  
                         Pattern.CASE_INSENSITIVE); 
  
        // find the flag of pattern 
        int flag = pattern.flags(); 
  
        System.out.println("Pattern's match flag = "
                           + flag); 
    } 
}

输出：

Pattern's match flag = 2

示例2:

// Java program to demonstrate 
// Pattern.compile method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a REGEX String 
        String REGEX = "(.*)(ee)(.*)?"; 
  
        // create the string 
        // in which you want to search 
        String actualString 
            = "geeks"; 
  
        // compile the regex to create pattern 
        // using compile() method 
        Pattern pattern = Pattern.compile(REGEX,  
                                 Pattern.MULTILINE); 
  
        // find the flag of pattern 
        int flag = pattern.flags(); 
  
        System.out.println("Pattern's match flag = "
                           + flag); 
    } 
}

输出：

Pattern's match flag = 8

参考文献：
https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#flags()

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注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 Pattern flags() 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。