quote(String) method of a Pattern class used to returns a literal pattern String for the specified String passed as parameter to method.This method produces a String equivalent to s that can be used to create a Pattern. Metacharacters or escape sequences in the input sequence will be given no special meaning. If you compile the value returned by the quote method, you’ll get a Pattern which matches the literal string that you passed as a parameter to method.\Q and \E mark the beginning and end of the quoted part of the string. Syntax:
public static String quote(String s)
Parameters: This method accepts a single parameter s which represents the string to be literalized. Return value: This method returns a literal string replacement for String s. Below programs illustrate the quote() method: Program 1:Â
Java
// Java program to demonstrate// Pattern.quote() methodÂ
import java.util.regex.*;Â
public class GFG {    public static void main(String[] args)    {        // create a REGEX String        String REGEX = "ee";Â
        // create the string        // in which you want to search        String actualString            = "neveropen";Â
        // create equivalent String for REGEX        String eqREGEX = Pattern.quote(REGEX);Â
        // create a Pattern using eqREGEX        Pattern pattern = Pattern.compile(eqREGEX);Â
        // get a matcher object        Matcher matcher = pattern.matcher(actualString);Â
        // 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());Â
            matchfound = true;        }        if (!matchfound) {            System.out.println("No match found for Regex.");        }    }} |
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
Time Complexity : O(n)
Space Complexity : O(1)
Program 2:Â
Java
// Java program to demonstrate// Pattern.quote() methodÂ
import java.util.regex.*;Â
public class GFG {    public static void main(String[] args)    {        // create a REGEX String        String REGEX = "welcome";Â
        // create the string        // in which you want to search        String actualString            = "welcome to jungle";Â
        // create equivalent String for REGEX        String eqREGEX = Pattern.quote(REGEX);Â
        // create a Pattern using eqREGEX        Pattern pattern = Pattern.compile(eqREGEX);Â
        // get a matcher object        Matcher matcher = pattern.matcher(actualString);Â
        // 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");        }    }} |
match found
Time Complexity : O(n)
Space Complexity : O(1)
Reference: https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#quote(java.lang.String)
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