Matcher reset(CharSequence) method in Java with Examples

Last Updated : 26 Nov, 2018

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:

   // 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()); 
    } 
} 
 
  

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:

   // 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()); 
    } 
} 
 
  

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

CharsetEncoder reset() method in Java with Examples

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Matcher reset(CharSequence) method in Java with Examples

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