Regex to filter on first occurrence of 3 or 4 digits in a sting

[Sairam_RPA (Mr.Robot)]

@Sairam_RPA

Request: ABCD5 SME Recom w/ Transfer

Hi Shubam,

I want the first part of the string.

“Request: ABCD5 SME Recom w/ Transfer” this value as output from first string input.

What you sent gives me the number.