code: public static boolean isHSLAColorValue (@Nullable final String sValue)
    {
      final String sRealValue = StringHelper.trim (sValue);
      return StringHelper.hasText (sRealValue) &&
             sRealValue.startsWith (CCSSValue.PREFIX_HSLA) &&
             RegExHelper.stringMatchesPattern (PATTERN_HSLA, sRealValue);
    }
docs: Check if the passed String is valid CSS HSLA color value. Example value:
  <code>hsla(255,0%,0%, 0.1)</code>
  
  @param sValue
  The value to check. May be <code>null</code>.
  @return <code>true</code> if it is a CSS HSLA color value,
  <code>false</code> if not