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Improved performance of the UTF-8 check
Fixes #2
Replaced the old algorithm with a simple regex check for UTF-8. Also added mb_detect_encoding if the ext-mbstring extension is enabled.
For small strings, mb_detect_encoding performs about the same as the regex.
For large strings, it appears that the regex is noticably quicker (e.g. 1.5x to 4x faster for a 10,000 byte sequence).
Compared to the old algorithm, both mb_detect_encoding and the regex are about 30x to 40x quicker.