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() methodimport 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() methodimport 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
