code: @Nullable
    public static ECSSUnit getMatchingUnitExclPercentage (@Nonnull final String sCSSValue)
    {
      final ECSSUnit eUnit = getMatchingUnitInclPercentage (sCSSValue);
      return eUnit == null || eUnit == ECSSUnit.PERCENTAGE ? null : eUnit;
    }
docs: Try to find the unit that is used in the specified values. This check is
  done using "endsWith" so you have to make sure, that no trailing spaces are
  contained in the passed value. This check excludes a check for percentage
  values (e.g. <code>10%</code>)
  
  @param sCSSValue
  The value to check. May not be <code>null</code>.
  @return <code>null</code> if no matching unit from {@link ECSSUnit} was
  found.
  @see #getMatchingUnitInclPercentage(String)