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());    }} |
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());    }} |
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
