Java Pattern quote(String)用法及代码示例

Pattern类的quote(String)方法用于为作为参数传递给方法的指定String返回文字模式Pattern String。此方法产生一个等效于s的String，可用于创建Pattern。输入序列中的元字符或转义序列将没有特殊含义。如果您对quote方法返回的值进行编译，则会得到一个Pattern，该Pattern与您作为参数传递给method的文字字符串相匹配。\ Q和\ E标记该字符串的引号部分的开头和结尾。

用法:

public static String quote(String s)

参数：此方法接受单个参数s，该参数s表示要被字符串化的字符串。

返回值：此方法返回String的文字字符串替换。

以下示例程序旨在说明quote()方法：
示例1:

// Java program to demonstrate 
// Pattern.quote() 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 
            = "geeksforgeeks"; 
  
        // create equivalent String for REGEX 
        String eqREGEX = Pattern.quote(REGEX); 
  
        // create a Pattern using eqREGEX 
        Pattern pattern = Pattern.compile(eqREGEX); 
  
        // get a matcher object 
        Matcher matcher = pattern.matcher(actualString); 
  
        // print values if match found 
        boolean matchfound = false; 
        while (matcher.find()) { 
            System.out.println("found the Regex in text:"
                               + matcher.group() 
                               + " starting index:"
                               + matcher.start() 
                               + " and ending index:"
                               + matcher.end()); 
  
            matchfound = true; 
        } 
        if (!matchfound) { 
            System.out.println("No match found for Regex."); 
        } 
    } 
}

输出：

found the Regex in text:ee starting index:1 and ending index:3
found the Regex in text:ee starting index:9 and ending index:11

示例2:

// Java program to demonstrate 
// Pattern.quote() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // create a REGEX String 
        String REGEX = "welcome"; 
  
        // create the string 
        // in which you want to search 
        String actualString 
            = "welcome to jungle"; 
  
        // create equivalent String for REGEX 
        String eqREGEX = Pattern.quote(REGEX); 
  
        // create a Pattern using eqREGEX 
        Pattern pattern = Pattern.compile(eqREGEX); 
  
        // get a matcher object 
        Matcher matcher = pattern.matcher(actualString); 
  
        // print values if match found 
        boolean matchfound = false; 
        while (matcher.find()) { 
            System.out.println("match found"); 
            matchfound = true; 
        } 
        if (!matchfound) { 
            System.out.println("No match found"); 
        } 
    } 
}

输出：

match found

参考： https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#quote(java.lang.String)

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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 quote(String) 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。