utf 8 - How to understand a range in hexadecimal -

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i have range:

u+f0000..u+ffffd

its utf, private use characters. understand f0000 ffffd means range, why u+ added in beggining? means?

the "u+" means it's unicode codepoint, "0x" means follows hexadecimal number. "u+" implies hexadecimal, follows in hexadecimal notation, represents codepoint in unicode.

in utf-8, u+f0000 encoded 0xf3 0xb0 0x80 0x80. u+ffffd encoded 0xf3 0xbf 0xbf 0xbd.


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