regular expression swift example

regex.swift

class Regex {
    let internalExpression: NSRegularExpression?
    let pattern: String
    
    init(_ pattern: String) {
        self.pattern = pattern
        do {
            self.internalExpression = try NSRegularExpression(pattern: pattern, options: .CaseInsensitive)
        } catch {
            self.internalExpression = nil
            print("\(error)")
        }
    }
    
    func test(input: String) -> Bool {
        let matches = self.internalExpression?.matchesInString(input, options:[], range: NSMakeRange(0, input.characters.count))
        
        return matches?.count > 0
    }
}

var reg = Regex("^https?:\\/\\/.*")
if reg.test("http://www.example.com") {
    print("pattern matched")
}