regex =~ operator for Swift

Regex.swift

import Foundation

/// See also
/// - https://github.com/kasei/SwiftRegex
struct Regex {
    
    private let pattern: String
    
    private let internalRegexp: NSRegularExpression
    
    init(_ pattern: String) {
        self.pattern = pattern
        self.internalRegexp = try! NSRegularExpression(pattern: pattern, options: NSRegularExpressionOptions.CaseInsensitive)
    }
    
    func isMatch(input: String) -> Bool {
        return matches(input).count > 0
    }
    
    func matches(input: String) -> [String] {
        let matches = internalRegexp.matchesInString(input, options: [], range: NSMakeRange(0, input.characters.count))
        
        return matches.reduce([]) { (acc, m) -> [String] in
            acc + [(input as NSString).substringWithRange(m.range)]
        }
    }
}

infix operator =~ {}
func =~ (input: String, pattern: String) -> [String] {
    return Regex(pattern).matches(input)
}

RegexExecute.swift

let pattern = "http://([a-zA-Z0-9]|.)+"
let str  = "銘柄コード:1557,銘柄名:SPDR S&P500 ETF TRUST板価格:25270.0,板数量:10000にいびつな板(寄与率:81.20178%)を検出しました。http://oreore.com/servlets/Action?SRC=1234"

Regex(pattern).isMatch(str) //=> true
(str =~ pattern).first //=> http以下を取得