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Regular Expression for ISBN number

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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,




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



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