Regular expression for a hexadecimal number?

Question

How do I create a regular expression that detects hexadecimal numbers in a text?

For example, ‘0x0f4’, ‘0acdadecf822eeff32aca5830e438cb54aa722e3’, and ‘8BADF00D’.

Answer 1

How about the following?

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

Matches expression starting with a 0, following by either a lower or uppercase x, followed by one or more characters in the ranges 0-9, or a-f, or A-F