Get Numbers Before String C#

I am trying to extract numbers before string on C#. Not numbers between or after strings. Only number before string.
I need theese results.

• dorosły ==> 0 or ""
• dziecko 0-3 lata ==> 0 or ""
• 1-osobowy quad ==> 1
• 9-osobowy quad ==> 9

I tried Regex on C# but I got "";

 string test =Regex.Match("1-osobowy", @"/^(\d)-.*/m").Value;

>Solution :

try this:

string test = Regex.Match("1-osobowy", @"^\d+").Value;