code: public static boolean contains (@Nullable final String sText, @Nullable final String sSearch)
    {
      return getIndexOf (sText, sSearch) != STRING_NOT_FOUND;
    }
docs: Check if sSearch is contained within sText.
  
  @param sText
  The text to search in. May be <code>null</code>.
  @param sSearch
  The text to search for. May be <code>null</code>.
  @return <code>true</code> if sSearch is contained in sText,
  <code>false</code> otherwise.
  @see String#contains(CharSequence)