How to get the numeric part from a string using T-SQL?

Question

I have the following string.

Input
--------------
2030031469-NAI 

To get the numeric part, I am using the following script

Answer 1

In case your string start with alphabet and end with number like ERT-123

you can use this query:

 (select  substring(@str,patindex('%[0-9]%', @str),len(@str)))