HTML Hexadecimal number

using regex to check a value is in hex format?

[raingerpete]

I am try to check if a 6 digit number is in hexadecimal?
e.g. FFFFFF

if (ereg ("\x[0-9A-Fa-f]{1,2}", $colour1))
{ echo "Continue......"; }
else { echo "Invalid format"; }

how do I change the regualar expression for 6 digits?

pete

[tepes]

Try {6} instead of {1,2}.