Matcher replaceAll(String) method in Java with Examples Last Updated : 01 Jul, 2020 Comments Improve Suggest changes Like Article Like Report 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 stringToBeReplaced which is the String to be replaced in the matcher. Return Value: This method returns a String with the target String constructed by replacing the String. Below examples illustrate the Matcher.replaceAll() method: Example 1: Java // Java code to illustrate replaceAll() 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 Geeks for For Geeks Geek"; // Create a matcher for the input String Matcher matcher = pattern.matcher(stringToBeMatched); System.out.println("Before Replacement: " + stringToBeMatched); // Get the String to be replaced String stringToBeReplaced = "GFG"; StringBuilder builder = new StringBuilder(); // Replace every matched pattern // with the target String // using replaceAll() method System.out.println("After Replacement: " + matcher .replaceAll(stringToBeReplaced)); } } Output: Before Replacement: GeeksForGeeks Geeks for For Geeks Geek After Replacement: GFGForGFG GFG for For GFG Geek Example 2: Java // Java code to illustrate replaceAll() method import java.util.regex.*; public class GFG { public static void main(String[] args) { // Get the regex to be checked String regex = "(FGF)"; // Create a pattern from regex Pattern pattern = Pattern.compile(regex); // Get the String to be matched String stringToBeMatched = "GFGFGFGFGFGFGFGFGFG FGF GFG GFG FGF"; // Create a matcher for the input String Matcher matcher = pattern.matcher(stringToBeMatched); // Get the String to be replaced String stringToBeReplaced = "GFG"; StringBuilder builder = new StringBuilder(); // Replace every matched pattern // with the target String // using replaceAll() method System.out.println("After Replacement: " + matcher .replaceAll(stringToBeReplaced)); } } Output: After Replacement: GGFGGGFGGGFGGGFGGFG GFG GFG GFG GFG Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#replaceAll-java.lang.String- Comment More infoAdvertise with us Next Article Matcher replaceAll(String) 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 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 String replace() method in Java with Examples The String replace() method returns a new string after replacing all the old characters/CharSequence with a given character/CharSequence. Example:Return a new string where all " o" characters are replaced with "p" character: Java // Java program to demonstrate // the replace() method public class Ma 4 min read Matcher quoteReplacement(String) method in Java with Examples The quoteReplacement(String string) method of Matcher Class is used to get the replacement String literal of the String passed as parameter. This String literal acts as the parameter for the replace methods. Hence quoteReplacement() method acts as the intermediate in the replace methods. Syntax: pub 2 min read String matches() Method in Java with Examples In Java, the matches() method in the String class checks if a string matches a specified regular expression. It is useful for validating input patterns and searching within strings. In this article, we will learn how to use the matches() method effectively in Java with examples to illustrate its fun 3 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 Like