This paragraph is a verification of what, can not understand?
/[\x01-\x7f]| [\XC2-\XDF] [\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]| [\xe1-\xef] [\X80-\XBF] [\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]| [\xf1-\xf7] [\X80-\XBF] [\X80-\XBF] [\x80-\xbf]/
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Verify whether the Utf-8 character
which
[\x01-\x7f] Single byte utf-8
[\XC2-\XDF] [\X80-\XBF] 2 bytes Utf-8
\XE0[\XA0-\XBF][\X80-\XBF] 3 bytes Utf-8
[\xe1-\xef] [\X80-\XBF] [\X80-\XBF] 3 bytes Utf-8
\XF0[\X90-\XBF][\X80-\XBF][\X80-\XBF] 4 bytes Utf-8
[\xf1-\xf7] [\X80-\XBF] [\X80-\XBF] [\X80-\XBF] 5 bytes Utf-8
Verify whether the Utf-8 character
which
[\x01-\x7f] Single byte utf-8
[\XC2-\XDF] [\X80-\XBF] 2 bytes Utf-8
\XE0[\XA0-\XBF][\X80-\XBF] 3 bytes Utf-8
[\xe1-\xef] [\X80-\XBF] [\X80-\XBF] 3 bytes Utf-8
\XF0[\X90-\XBF][\X80-\XBF][\X80-\XBF] 4 bytes Utf-8
[\xf1-\xf7] [\X80-\XBF] [\X80-\XBF] [\X80-\XBF] 5 bytes Utf-8
Theo, it's been taught, thanks!