Regular expression to find German phone numbers

PhoneNumberMatcher.java

/*
 * ==========================================================================
 * Licensed under the  Apache License, Version 2.0  (the "License").  You may
 * not use this file except in compliance with the License.  You may obtain a
 * copy of the License at <http://www.apache.org/licenses/LICENSE-2.0>.
 *
 * Unless  required  by applicable  law or  agreed  to  in writing,  software
 * distributed under the License is distributed on an  "AS IS" BASIS, WITHOUT
 * WARRANTIES OR  CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the  specific language  governing permissions  and limitations
 * under the License.
 * ==========================================================================
 */
package com.mindoo.contentregexp;

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

/**
 * Utility class to extract German phone numbers from a given String via regular expression.<br>
 * 
 * @author Karsten Lehmann, Mindoo GmbH
 */
public class PhoneNumberMatcher {

  public static void main(String[] args) {
    try {
      PhoneNumberMatcher m = new PhoneNumberMatcher();
      m.run();
      System.exit(0);
    }
    catch (Exception e) {
      e.printStackTrace();
      System.exit(-1);
    }
    
  }

  private void run() {
    String str = "Lorem ipsum +49 (721) 46139940 "
        + "Lorem ipsum +49 (721) 461 399 40 "
        + "Lorem ipsum +49 (721) 461 399-40 "
        + "Lorem ipsum +49 (721) 461 399 - 40 "
        + "Lorem ipsum +49 (721)461 399-40 "
        + "Lorem ipsum +49 (721)461399-40 "

        
        + "Lorem ipsum (0721) 46139940 "
        + "Lorem ipsum (0721) 461 399 40 "
        + "Lorem ipsum (0721) 461399-40 "
        + "Lorem ipsum (0721) 461 399-40 "
        + "Lorem ipsum (0721) 461 399 - 40 "
        
        + "Lorem ipsum 0721/46139940 "
        + "Lorem ipsum 0721 / 46139940 "
        + "Lorem ipsum 0721 / 461399-40 "
        + "Lorem ipsum 0721 / 461 399-40 "
        + "Lorem ipsum 0721 / 461 399 - 40.";
    
    Set<String> allMatches = findMatches(str);

    System.out.println(allMatches.size()+" matches found");
    allMatches.forEach((line) -> { System.out.println(line); });
    
  }
  
  public static Set<String> findMatches(String str) {
    Set<String> allMatches = new LinkedHashSet<String>();
    
    {
//      +49 (721) 46139940
//      +49 (721) 461 399 40
//      +49 (721) 461 399-40
//      +49 (721) 461 399 - 40
//      +49 (721)461 399-40
//      +49 (721)461399-40
      
      Matcher m = Pattern.compile("(\\+\\d+[ ]+\\(\\d+\\)[ ]?[\\d -]+)")
          .matcher(str);
      
        while (m.find()) {
            String currNumber = m.group().trim();
            
            if (currNumber.length()>0) {
              allMatches.add(currNumber);
            }
          }
    }
    
    {
//      (0721) 46139940
//      (0721) 461 399 40
//      (0721) 461399-40
//      (0721) 461 399-40
//      (0721) 461 399 - 40
      Matcher m = Pattern.compile("(\\(0\\d+\\)[\\d -]+)")
          .matcher(str);
      
        while (m.find()) {
            String currNumber = m.group().trim();
            
            if (currNumber.length()>0) {
              allMatches.add(currNumber);
            }
          }
    }
    
    
    {
//      0721/46139940
//      0721 / 46139940
//      0721 / 461399-40
//      0721 / 461 399-40
//      0721 / 461 399 - 40
      Matcher m = Pattern.compile("(0\\d+[ ]?/[ \\d-]+)")
          .matcher(str);
      
        while (m.find()) {
            String currNumber = m.group().trim();
            
            if (currNumber.length()>0) {
              allMatches.add(currNumber);
            }
          }
    }

    {
//    	+49 (0)721 46139940
//    	+49 (0)721 461 399 40 
//    	+49 (0)721 461 399-40 
//    	+49 (0)721 461 399 - 40 
//    	+49 (0)721461 399-40 
//    	+49 (0)721461399-40 
//
//    	+49 (0)721 / 46139940 
//    	+49 (0)721 / 461 399 40 
//    	+49 (0)721 / 461 399-40 
//    	+49 (0)721 / 461 399 - 40 
//    	+49 (0)721461 / 399-40 
//
//    	+49 (0)721/46139940 
//    	+49 (0)721/461 399 40 
//    	+49 (0)721/461 399-40 
//    	+49 (0)721/461 399 - 40 
//    	+49 (0)721461/399-40 
//    	+49 (0)721461/399-40
    	
    	Matcher m = Pattern.compile("(\\+\\d+[ ]?\\(0\\)[\\d -/]+)")
    			.matcher(str);

    	while (m.find()) {
    		String currNumber = m.group().trim();

    		if (currNumber.length()>0) {
    			allMatches.add(currNumber);
    		}
    	}
    }
    
    return allMatches;
  }
}