How to set a condition in a regular expression?

Question

Regular Expressions

There is a regular expression:

@"\b\(d{1})*?-??(\d{1})*?\s.*" + surname + @"\s.*(\d{1})\b";

, which works with strings like:

• 4. Sub 1-2 Fam 53
  
• 5-6. Sub 1-2 Fam 51
  

If there is a "-" sign, then you need to count two numbers, before and after "-", if not, then only one number
The expression incorrectly processes the first line and displays 37 4. Sub 1-2 Fam 53
Is it possible to bind the number of numbers to be read to the "-" sign?