Matcher appendReplacement(StringBuilder, String) method in Java with Examples Last Updated : 27 Nov, 2018 Summarize Comments Improve Suggest changes Share Like Article Like Report The appendReplacement(StringBuilder, 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 Matcher appendReplacement(StringBuilder builder, String stringToBeReplaced) Parameters: This method takes two parameters: builder: which is the StringBuilder that stores the target string. stringToBeReplaced: which is the String to be replaced in the matcher. Return Value: This method returns a Matcher with the target String replaced. Exception: This method throws following exceptions: IllegalStateException: If no match has yet been attempted, or if the previous match operation failed IllegalArgumentException: If the replacement string refers to a named-capturing group that does not exist in the pattern IndexOutOfBoundsException: If the replacement string refers to a capturing group that does not exist in the pattern Below examples illustrate the Matcher.appendReplacement() method: Example 1: Java // Java code to illustrate appendReplacement() 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 = "GEEKS"; StringBuilder builder = new StringBuilder(); // Replace every matched pattern // with the target String // using appendReplacement() method while (matcher.find()) { matcher.appendReplacement(builder, stringToBeReplaced); } matcher.appendTail(builder); // Print the replaced matcher System.out.println("After Replacement: " + builder.toString()); } } Output: Before Replacement: GeeksForGeeks Geeks for For Geeks Geek After Replacement: GEEKSForGEEKS GEEKS for For GEEKS Geek Example 2: Java // Java code to illustrate appendReplacement() 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 = "FGF FGF FGF FGF"; // 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 appendReplacement() method while (matcher.find()) { matcher.appendReplacement(builder, stringToBeReplaced); } matcher.appendTail(builder); // Print the replaced matcher System.out.println("After Replacement: " + builder.toString()); } } Output: Before Replacement: FGF FGF FGF FGF After Replacement: GFG GFG GFG GFG Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#appendReplacement-java.lang.StringBuilder-java.lang.String- Comment More infoAdvertise with us Next Article Matcher appendReplacement(StringBuffer, 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 appendReplacement(StringBuffer, String) method in Java with Examples The appendReplacement(StringBuffer, String) method of Matcher Class behaves as a append-and-replace method. 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