Make regex minimal for filename?

Question

Regular Expressions

Please help write a regex to validate a filename with this pattern:

SM_YYYYQ#_{Vendor_Name}_{RFI_Round}_{version}.xslx
SM_YYYYQ#_{Vendor_Name}_{RFI_Round}_{version}.xsl

Name example
SM_2020Q1_Vendor_20R1_1.xls

SM-always constant
YYYYQ# is year + quarter. Q# can take the values ​​(Q1-Q4)
Vendor_Name - anything, just the name
RFI_Round - a combination of two digits-letter latin-digit . Example 20R1
version - one digit

Answer 1

^SM_\d{4}Q\d_.*?_\d\d[A-Z]\d_\d\.xls$
https://regex101.com/r/9711ng/1