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About Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Matcher reset example

This is an example of how to use Matcher.reset() API method to reset a Matcher, by discarding all of its explicit state information and setting its append position to zero. The matcher’s region is set to the default region, which is its entire character sequence. Resetting a matcher implies that you should:

  • Compile a String regular expression to a Pattern, using compile(String regex) API method of Pattern.
  • Use matcher(CharSequence input) API method of Pattern to create a Matcher that will match the given String input against this pattern.
  • Use find() and match() API methods of Matcher to get the matches of the input with the pattern.
  • Use reset() API method of Matcher to reset tha matcher and then find() and match() API methods of Matcher to get the matches of the input with the pattern again.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MatcherReset {
    
  public static void main(String args[]) {
    function();
  }

  public static void function() {
    Pattern pattern = Pattern.compile("\\d");
    Matcher matcher = pattern.matcher("01234");

    while (matcher.find()) {

System.out.println("" + matcher.group());
    }
    matcher.reset();
    System.out.println("After resetting the Matcher");
    while (matcher.find()) {

System.out.println("" + matcher.group());
    }
  }
}

Output:

0
1
2
3
4
After resetting the Matcher
0
1
2
3
4

 
This was an example of Matcher.reset() API method in Java.

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