Regex to get string before and after a hyphen

[aehrenwo]

I am trying to isolate text that can appear in the following format in a string field. 

7-23 or 100-22 or 17-23 --- so the text before the hyphen can be 1 or 3 digits, and the text after is a two-digit number with spaces on either side. 

I am hoping the regex for this is relatively simple, but not finding examples when searching. 

[Raj]

Can you share sample input and outputs.

[aehrenwo]

Here are two examples --- with the expected result in () 

MAP for SI#303-22 (303-22) 
SI# 3-23 Code of Conduct Training for Z's R&D (3-23) 

[Raj · Accepted solution]

(?:SI#\s*)?(\d{1,3}-\d{2})
@aehrenwo this works for your case

[aehrenwo]

Thanks! worked great.