Hexadecimal values can be represented as two alphanumeric characters (a to f, and A to F, and 0 to 9) preceded by "\x"; thus "\x00" is a proper hex string. The range is from \x00 to \xFF, and matching must be case-insensitive.
Pattern | Description |
|---|---|
\x90\x90\x90 | Example of hex used to represent binary; often used in shellcode attacks. |