Matcher usePattern(Pattern) method in Java with Examples

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:

filter_none

edit
close

play_arrow

link
brightness_4
code

// 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());
    }
}

chevron_right


Output:

Old Pattern: Geeks
New Pattern: GFG

Example 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// 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
            = patter
                  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());
    }
}

chevron_right


Output:

Old Pattern: GFG
New Pattern: Geeks

Reference: Oracle Doc



My Personal Notes arrow_drop_up

Recommended Posts: