It's also important, I feel, to note that this is not necessarily UTF-8.

 Latin-1 (ISO 8859-1)
    \x3a = 58 = : = chr(58) = "\x{3a}"
    \x2f = 47 = / = chr(47) = "\x{2f}"
 ASCII: ditto
 UTF-8: same same
 Windows-1252: also, also

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Unless it's been specifically decoded to UTF-8 (or one of the others) from a known source encoding, or it appeared in a use utf8 script literally, it is a risky assumption.

In reply to Re^2: Unescaping JavaScript string by Your Mother
in thread Unescaping JavaScript string by a01

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