Regex formula validation for multiple possible string inputs

Question

Require some help with building Regex formula to validate input string.

Below is my formula that I've come with so far but some parts does not work as per required.

Requirements:-

Acceptable Input String

• Mandatory Character Length between 8,16
• Mandatory String Content Alphanumeric with 1 minimum Alpha --> Does not work
• Optional Special Characters ._- --> Does not work

Samples:

 -'11910281 --> Not Match'    
 -'9U910281 --> Match'    
 -'BC189201 --> Match'    
 -'BC189201.01 --> Match'    
 -'BC189201_01 --> Match'      
 -'BC189201-01 --> Match'

OR String as below

 MTMBX|MTTBX|MTRBX|MTRBX|MTREJ

Not Acceptable Input String With Prefix

 GMSS|GTSS|GRRT|REJS

Answer 1

You could use

^(?!GMSS|GTSS|GRRT|REJS)(?:(?=[^A-Z\s]*[A-Z])[A-Z0-9._-]{8,16}|MTMBX|MTTBX|MTRBX|MTRBX|MTREJ)$

The pattern matches:

• ^ Start of string
• (?!GMSS|GTSS|GRRT|REJS) Negative lookahead, assert not any of the alternatives
• (?: Non capture group
  • (?=[^A-Z\s]*[A-Z]) Positive lookahead, assert at least a single char A-Z
  • [A-Z0-9._-]{8,16} Match any of the listed 8-16 times
  • | Or
  • MTMBX|MTTBX|MTRBX|MTRBX|MTREJ Match any of the allowed alternatives
• ) Close non capture group
• $ End of string

Regex demo