[SOLVED] Swift RegexBuilder convert date String to Date

Swift RegexBuilder convert date String to Date

I know the usual way of using DateFormatter style with option of .withFullDate to convert a date of style "yyyy-MM-dd" (ISO 8601 but just date, not time or timezone) into Swift Date

let formatter = ISO8601DateFormatter()
formatter.formatOptions = [.withFullDate]
let date = formatter.date(from: "2023-10-21")

But I am wondering if it is possible to achieve this with new Swift's RegexBuilder Capture and maybe with Transform? It seems the .date(...) function requires locale but I do not care for the locale, I just want a String date to convert into Date.

Is it possible to do this using built in date formatter in RegexBuilder? i.e. without writing literal Regex.

Solution

You can capture the date string as a Date directly

One(.iso8601.year().month().day().dateSeparator(.dash))

Example

let input = "2023-10-21 some other stuff"

let regex = Regex {
    Capture {
        One(.iso8601.year().month().day().dateSeparator(.dash))
    }
    OneOrMore(.any)
}

if let match = input.firstMatch(of: regex) {
    print(match.output.1, type(of: match.output.1))
}

2023-10-21 00:00:00 +0000 Date