String extension to replace text using Regular Expression

String+RegexReplace.swift

public extension String {
    
    //
    // Example
    //   "Hello World!".replace(pattern: "Hello (.*)", template: "Goodbye $1") -> "Goodbye World!"
    //
    func replace(pattern: String, template: String) -> String? {
        do {
            let regex = try NSRegularExpression(pattern: pattern, options: [])
            let replacedString = regex.stringByReplacingMatches(in: self,
                                                                options: [],
                                                                range: NSRange(location: 0, length: count),
                                                                withTemplate: template)
            return replacedString
            
        } catch {
            print(error)
        }
        
        return nil
    }
    
}