I gave it a whirl and it correctly rejects examples of each 'invalid byte sequence' cited by wikipedia. "\xff", // invalid byte "\x82", // unexpected c

I gave it a whirl and it correctly rejects examples of each 'invalid byte sequence' cited by wikipedia. "\xff", // invalid byte "\x82", // unexpected continuation byte "\xc0", // not enough continuation bytes "\xed\xa0", // not enough continuation bytes "\xc0\x80", // "modified UTF-8's not really NUL (over-long encoding) "\xf0\x82\x82\x8c", // over-long euro symbol "\xed\xa0\x80", // invalid surrogate character U+d800