swift swift中的正则表达式扩展

Posted 2021-05-19

//
// Created by Joshua Weinstein on 4/29/16.
// Copyright (c) 2016 Geeni. All rights reserved.
//

import Foundation
//extension that allows to test for a match in a string
extension String {
    func matchPattern(patStr:String)->Bool {
        var isMatch:Bool = false
        do {
            let regex = try NSRegularExpression(pattern: patStr, options: [.CaseInsensitive])
            let result = regex.firstMatchInString(self, options: NSMatchingOptions(rawValue: 0), range: NSMakeRange(0, characters.count))

            if (result != nil)
            {
                isMatch = true
            }
        }
        catch {
            isMatch = false
        }
        return isMatch
    }
}

//extension that allows for matches in a string to be extracted
extension String {
    func matchesForRegexInText(regex: String!) -> [String] {

        do {
            let regex = try NSRegularExpression(pattern: regex, options: [])
            let nsString = self as NSString
            let results = regex.matchesInString(self,
                    options: [], range: NSMakeRange(0, nsString.length))
            return results.map { nsString.substringWithRange($0.range)}
        } catch let error as NSError {
            print("invalid regex: \(error.localizedDescription)")
            return []
        }
    }
}