Regular Expression for ISBN number

[Sandeep590]

Hello Everyone,

 

 

                        In the  process of displaying all the ISBN numbers from the text file, I was using below regular expression which accepts any integer.(In some instances, 10 digit ISBN number ends with X).

 

                        Regular Expression : preg_match_all('/\d+(?:\d|X)/')

 

 

Can anyone tell me what would be the regular expression if any alpha digits like A B C .. Z replaces X in the above expression.

 

                I have replaced X with [a-z][A-Z] in above regular expression but it dint worked out.

 

 

 

With Regards,

Sandeep.

 

                        

[Psycho]

This should match any input that starts with 1 or more numbers with an optional letter at the end:

 

preg_match_all('/\d+([a-zA-Z])?/')