code: public static ExpectedCondition<Boolean> urlMatches(final String regex) {
      return new ExpectedCondition<Boolean>() {
        private String currentUrl;
        private Pattern pattern;
        private Matcher matcher;
  
        @Override
        public Boolean apply(WebDriver driver) {
          currentUrl = driver.getCurrentUrl();
          pattern = Pattern.compile(regex);
          matcher = pattern.matcher(currentUrl);
          return matcher.find();
        }
  
        @Override
        public String toString() {
          return String
            .format("url to match the regex \"%s\". Current url: \"%s\"", regex, currentUrl);
        }
      };
    }
docs: Expectation for the URL to match a specific regular expression
  
  @param regex the regular expression that the URL should match
  @return <code>true</code> if the URL matches the specified regular expression