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 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 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-
