2.1.41 [ECMA-262/7] Section 21.2.2.10 CharacterEscape

V0175: Characters other than those matched by ControlLetter (non-alphabetic characters) are allowed

The specification states:

 21.2.2.10 CharacterEscape
     ...
     The production CharacterEscape :: c ControlLetter evaluates as follows:
  
         1.  Let ch be the character matched by ControlLetter.
         2.  Let i be ch's character value.
         3.  Let j be the remainder of dividing i by 32.
         4.  Return the character whose character value is j.

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Characters other than those matched by ControlLetter (non-alphabetic characters) are allowed.