Java 中的模式标志()方法，示例

原文:https://www . geesforgeks . org/pattern-flags-in-Java-method-with-examples/

Java 中模式类的 flags() 方法用于返回模式的匹配标志。匹配标志是一个位掩码，可以包括不区分大小写、多行、多行、UNICODE_CASE、CANON_EQ、UNIX_LINES、LITERAL、UNICODE_CHARACTER_CLASS 和注释标志。

语法:

public int flags()

参数:该方法不接受任何参数。

返回值:这个方法返回模式的匹配标志。

下面的程序说明了 flags()方法:

程序 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);
    }
}

Output:

Pattern's match flag = 2

程序 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);
    }
}

Output:

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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