code: public CollectionAssert allElementsMatch(String regex) {
  		isNotNull();
  		isNotEmpty();
  		for (Object anActual : this.actual) {
  			if (anActual == null) {
  				failWithMessageRelatedToRegex(regex, anActual);
  			}
  			String value = anActual.toString();
  			if (!value.matches(regex)) {
  				failWithMessageRelatedToRegex(regex, value);
  			}
  		}
  		return this;
  	}
docs: Asserts all elements of the collection whether they match a regular expression.
  @param regex - regular expression to check against
  @return this