Question

I am trying to combine 2 regular expressions into 1 with the OR operator: |

I have one that checks for match of a letter followed by 8 digits:

Regex.IsMatch(s, "^[A-Z]\d{8}$")

I have another that checks for simply 9 digits:

Regex.IsMatch(s, "^\d{9}$")

Now, Instead of doing:

If Not Regex.IsMatch(s, "^[A-Z]\d{8}$") AndAlso
   Not Regex.IsMatch(s, "^\d{9}$") Then 
    ...
End If

I thought I could simply do:

If Not Regex.IsMatch(s, "^[A-Z]\d{8}|\d{9}$") Then
    ...
End If

Apparently I am not combining the two correctly and apparently I am horrible at regular expressions. Any help would be much appreciated.

And for those wondering, I did take a glance at How to combine 2 conditions and more in regex and I am still scratching my head.

Answer 1

How about using ^[A-Z0-9]\d{8}$ ?