matching3.swift

import RegexBuilder

let regex = Regex {
    "Hi, WWDC"
    Capture {
        Repeat(.digit, count: 2)
    }
    "!"
}

let input = "Hi, WWDC21! Hi, WWDC22! Hi Hello"

if let firstMatch = input.firstMatch(of: regex) {
    let (firstMatched, digits) = firstMatch.output
    print(firstMatched) // Hi, WWDC21!
    print(digits) // 21
}