Swift replace substring regex

Question

I am attempting to use regular expression to replace all occurrences of UK car registrations within a string.

The following swift code works perfectly for a when the

Answer 1

Let's use a class extension to wrap this up in Swift 3 syntax:

extension String {
    mutating func removingRegexMatches(pattern: String, replaceWith: String = "") {
        do {
            let regex = try NSRegularExpression(pattern: pattern, options: .caseInsensitive)
            let range = NSRange(0, count)
            self = regex.stringByReplacingMatches(in: self, options: [], range: range, withTemplate: replaceWith)
        } catch { return }
    }
}

var phoneNumber = "+1 07777777777"
phoneNumber.removingRegexMatches(pattern: "\\+\\d{1,4} (0)?")

Results in 7777777777 (thus removing country code from phone number)