Is the field you’re looking to parse always that format of a 3 digit number, space, name?
Well, that was just an example. But let me play along and answer your question no. What is a constant is there’s always a number, then a space, then some sort of text string. But the number part might be “8” or “80” or “160” or “1600”.
In FileMaker I could do this about ten different ways. Here’s one:
GetasNumber ( LeftWords ( "125 William Porter" ; 1 ) )
Little harder to do in Airtable because there’s no LeftWords() function, but in Airtable’s otherwise pretty bad calc feature you can at least get the position of the first space in the string, and then use that value to get all the characters on the left prior to the location of that space.