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:
Java
// Java program to demonstrate// Pattern.quote() methodimport 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 = "neveropen"; // 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."); } }} |
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:
Java
// Java program to demonstrate// Pattern.quote() methodimport 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"); } }} |
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)