[pcre-dev] PCRE regex for hex number

I use the following regex.

^[-+]?0[Xx][[:xdigit:]]+(?![.G-Zg-z])

and the following string

0x10g

on using PCRE.

https://regex101.com/

It matches 0x1. I want it to be no match. Is there a way to modify the
regex so that only matches valid hex numbers? Thanks.

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Regards,
Peng