Regex Helpers for Swift

Regex.swift

import Foundation

public struct Regex {
    
    private let expression: NSRegularExpression
    
    private let pattern: String
    
    public init?(pattern _pattern: String) {
        
        self.pattern = _pattern
        
        do {
            
            self.expression = try NSRegularExpression(
                pattern: self.pattern,
                options: .caseInsensitive)
        }
        catch {
            
            return nil
        }
    }
    
    public func matches(in input: String) -> Bool {
        
        guard let range = NSRange(input), let matches = self.expression.matches(in: input, options: [], range: range) else {
                
            return false
        }
        
        return matches
    }
}

extension String {
    
    public func matches(pattern: String) -> Bool {
        
        guard let regex = Regex(pattern: pattern) else {
            
            return false
        }
        
        return regex.matches(in: self)
    }
}