Java Pattern pattern()用法及代码示例

Java中Pattern类的pattern()方法用于获取正则表达式，将其编译以创建此模式。我们使用正则表达式创建模式，并且使用此方法来获取相同的源表达式。

用法:

public String pattern()

参数：此方法不接受任何内容作为参数。

返回值：此方法返回模式的源正则表达式。

以下示例程序旨在说明pattern()方法：
示例1:

// Java program to demonstrate 
// Pattern.pattern() 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"; 
  
        // create pattern 
        Pattern pattern1 = Pattern.compile(REGEX); 
  
        // find the regular expressio of pattern 
        String RegularExpression = pattern1.pattern(); 
  
        System.out.println("Pattern's RegularExpression = "
                           + RegularExpression); 
    } 
}

输出：

Pattern's RegularExpression = (.*)(for)(.*)?

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"; 
  
        // create pattern 
        Pattern pattern1 = Pattern.compile(REGEX); 
  
        // find the regular expressio of pattern 
        String RegularExpression = pattern1.pattern(); 
  
        System.out.println("Pattern's RegularExpression = "
                           + RegularExpression); 
    } 
}

输出：

Pattern's RegularExpression = (.*)(ee)(.*)?

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

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