2.1.925 Part 4 Section 3.17.7.40, CLEAN

a.   The standard states that the function makes a string that is a copy of string with all so-called non-printable characters—those with internal values in the range U+0000–001F—removed.

In Office, the function makes a string that is a copy of string with all so-called non-printable characters removed; specifically, those characters with internal values in the Unicode ranges U+0000 – U+001F and U+0080 – U+009F are removed.

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