Matcher usePattern(Pattern) method in Java with Examples Last Updated : 25 Mar, 2022 Comments Improve Suggest changes Like Article Like Report The usePattern() method of Matcher Class is used to get the pattern to be matched by this matcher. Syntax: public Matcher usePattern(Pattern newPattern) Parameters: This method takes a parameter newPattern which is the new pattern to be set. Return Value: This method returns a Matcher with the new Pattern. Exception: This method throws IllegalArgumentException if newPattern is null. Below examples illustrate the Matcher.usePattern() method: Example 1: Java // Java code to illustrate usePattern() method import java.util.regex.*; public class GFG { public static void main(String[] args) { // Get the regex to be checked String regex = "Geeks"; // Create a pattern from regex Pattern pattern = Pattern.compile(regex); // Get the String to be matched String stringToBeMatched = "GeeksForGeeks"; // Create a matcher for the input String Matcher matcher = pattern .matcher(stringToBeMatched); // Get the new Pattern String newPattern = "GFG"; // Get the Pattern using pattern method System.out.println("Old Pattern: " + matcher.pattern()); // Set the newPattern using usePattern() method matcher = matcher .usePattern( Pattern .compile(newPattern)); // Get the Pattern // using pattern method System.out.println("New Pattern: " + matcher.pattern()); } } Output:Old Pattern: Geeks New Pattern: GFG Example 2: Java // Java code to illustrate usePattern() method import java.util.regex.*; public class GFG { public static void main(String[] args) { // Get the regex to be checked String regex = "GFG"; // Create a pattern from regex Pattern pattern = Pattern.compile(regex); // Get the String to be matched String stringToBeMatched = "GFGFGFGFGFGFGFGFGFG"; // Create a matcher for the input String Matcher matcher = pattern n.matcher(stringToBeMatched); // Get the new Pattern String newPattern = "Geeks"; // Get the Pattern using pattern method System.out.println("Old Pattern: " + matcher.pattern()); // Set the newPattern using usePattern() method matcher = matcher .usePattern( Pattern .compile(newPattern)); // Get the Pattern // using pattern method System.out.println("New Pattern: " + matcher.pattern()); } } Output:Old Pattern: GFG New Pattern: Geeks Reference: Oracle Doc Comment More infoAdvertise with us Next Article Matcher usePattern(Pattern) method in Java with Examples K Kirti_Mangal Follow Improve Article Tags : Java Java - util package Java-Functions Java-Matcher Practice Tags : Java Similar Reads Matcher start(String) method in Java with Examples The start(String string) method of Matcher Class is used to get the start index of the match result already done, from the specified string. Syntax: public int start(String string) Parameters: This method takes a parameter string which is the String from which the start index of the matched pattern 2 min read Matcher reset() Method in Java with Examples The reset() method of Matcher Class is used to reset this matcher, in order to understand it better it is recommended to have prior knowledge of Pattern and Matcher class in java regex sub-package. Here we will be illustrating it with help of Java programs. Syntax: public Matcher reset() Parameters: 2 min read Matcher toString() method in Java with Examples The toString() method of Matcher Class is used to get the String representation of this matcher. This method is derived from the Object Class and behaves in the similar way. Syntax: public String toString() Parameters: This method takes no parameters. Return Value: This method returns a String value 2 min read Matcher replaceFirst(String) Method in Java with Examples The replaceFirst() method of Matcher Class behaves as an append-and-replace method. This method reads the input string and replaces it with the first matched pattern in the matcher string. Syntax: public String replaceFirst(String stringToBeReplaced) Parameters: The string to be replaced that is the 2 min read Matcher replaceAll(String) method in Java with Examples The replaceAll(String) method of Matcher Class behaves as a append-and-replace method. This method reads the input string and replace it with the matched pattern in the matcher string. Syntax: public String replaceAll(String stringToBeReplaced) Parameters: This method takes a parameter stringToBeRep 2 min read Like