Matcher reset(CharSequence) method in Java with Examples

The reset(CharSequence input) method of Matcher Class is used to reset this matcher and insert the input String passed as the parameter to this matcher.

Syntax:

public Matcher reset(CharSequence input)

Parameters: This method takes the parameter input which is the String to be inserted into matcher after getting reset.



Return Value: This method returns this Matcher after being reset with this input.

Below examples illustrate the Matcher.reset() method:

Example 1:

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// Java code to illustrate reset() 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 current matcher state
        System.out.println("Current Matcher: "
                           + matcher.toMatchResult());
  
        // Reset the Matcher using reset() method
        String newStringToBeMatched
            = "GeeksGeeksGeeks";
        matcher = matcher
                      .reset(newStringToBeMatched);
  
        // Get the current matcher state
        System.out.println("Current Matcher after Reset: "
                           + matcher.toMatchResult());
    }
}

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Output:

Current Matcher: java.util.regex.Matcher[pattern=Geeks region=0,13 lastmatch=]
Current Matcher after Reset: java.util.regex.Matcher[pattern=Geeks region=0,15 lastmatch=]

Example 2:

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// Java code to illustrate reset() 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
            = pattern
                  .matcher(stringToBeMatched);
  
        // Get the current matcher state
        System.out.println("Current Matcher: "
                           + matcher.toMatchResult());
  
        // Reset the Matcher using reset() method
        String newStringToBeMatched
            = "GFG means GeeksForGeeks";
        matcher = matcher
                      .reset(newStringToBeMatched);
  
        // Get the current matcher state
        System.out.println("Current Matcher after Reset: "
                           + matcher.toMatchResult());
    }
}

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Output:

Current Matcher: java.util.regex.Matcher[pattern=GFG region=0,19 lastmatch=]
Current Matcher after Reset: java.util.regex.Matcher[pattern=GFG region=0,23 lastmatch=]

Reference: Oracle Doc



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