code: @Nonnull
    public static Pattern getPattern (@Nonnull @Nonempty @RegEx final String sRegEx)
    {
      return getInstance ().getFromCache (new RegExPattern (sRegEx));
    }
docs: Get the cached regular expression pattern.
  
  @param sRegEx
  The regular expression to retrieve. May neither be <code>null</code>
  nor empty.
  @return The compiled regular expression pattern and never <code>null</code>
  .
  @throws IllegalArgumentException
  If the passed regular expression has an illegal syntax