Regex for Hexadecimal number

Matches a hex literal like 0x1A3F.

^0[xX][0-9a-fA-F]+$

Proof it works

5/5 sample tests passed · compiles: true

Sample	Should match	Result
`0x1A3F`	yes	pass
`0Xff`	yes	pass
`1A3F`	no	pass
`0x`	no	pass
`0xZZ`	no	pass

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