WebLinkValidator

public class  WebLinkValidator {
  
  private final static String linkRegex = "((([A-Za-z]{3,9}:(?://)?)(?:[\\-;:&=\\+\\$,\\w]+@)?[A-Za-z0-9\\.\\-]+|(?:www\\.|[\\-;:&=\\+\\$,\\w]+@)[A-Za-z0-9\\.\\-]+)((?:/[\\+~%/\\.\\w\\-]*)?\\??(?:[\\-\\+=&;%@\\.\\w]*)#?(?:[\\.\\!/\\\\\\w]*))?)";
  
  /**
  * Examples of valid web links are:
  * <ul>
  * <li>"www.site.com"</li>
  * <li>"http://www.site.com"</li>
  * <li>"mailto:lucy@site.com"</li>
  * <li>"lucy@site.com"</li>
  * <li>"www.site-query.com/?q=a-query-string"</li>
  * </ul>
  * 
  * @param webLink string representation of a link to be validated
  * @return 
  */
  public static boolean isWebLink(String webLink) {
	try {
		Pattern patt = Pattern.compile(linkRegex);
		Matcher matcher = patt.matcher(webLink);
		return matcher.matches();
	} catch (RuntimeException e) {
		return false;
	}
  }
}