NSRegularExpression with template in Swift

I'm obtaining a response to an HTTP POST request with the code

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {data, response, error in if error != nil { println("error=\(error)") return } // Get the response to the HTTP POST var responseString = NSString(data: data, encoding: NSUTF8StringEncoding)!} task.resume()

I tried to define two regular expressions

let regex0: NSRegularExpression = NSRegularExpression(pattern: "<b>District Representatives:</b>", options: NSRegularExpressionOptions.DotMatchesLineSeparators, error: nil)! let regex1: NSRegularExpression = NSRegularExpression(pattern: "\\A.*<b>District Representatives:</b>.*href=\"http://www\.sec\.state\.ma\.us/ele/eledist/con11idx\.htm#D[1-9]\" target=\"_blank\">(.*?)</a>.*href=\"http://www\.sec\.state\.ma\.us/ele/eledist/sen11idx\.htm#[0-9]{0,5}[a-z]{1,20}\" target=\"_blank\">(.*?)</a>.*\"http://www\.sec\.state\.ma\.us/ele/eledist/reps11idx\.htm#[a-z]{1,13}[0-9]{0,2}\" target=\"_blank\">(.*?)</a>.*\\z", options: NSRegularExpressionOptions.DotMatchesLineSeparators, error: nil)!

But Xcode gives me the error message "Expected expression" on the definition of regex1.

I want to test whether responseString is matched by regex0. I tried using

var numberOfMatches: Int = regex0.numberOfMatchesInString(responseString, options:nil, range: (NSMakeRange(0, responseString.length)))

but I got the error message "Use of unresolved identifier responseString"

I'd like to know how to test for the success of a regular expression match. In this case, I could just test whether responseString contains my test string. That seems to work nicely with Swift Strings, but I can't get it to work with an NSString.

I think the pattern in my regex1 regular expression is OK, because I tested the equivalent pattern in TextWrangler. The pattern I used there was

(?s)\A.*<b>District Representatives:</b>.*href="http://www\.sec\.state\.ma\.us/ele/eledist/con11idx\.htm#D[1-9]" target="_blank">(.*?)</a>.*href="http://www\.sec\.state\.ma\.us/ele/eledist/sen11idx\.htm#[0-9]{0,5}[a-z]{1,20}" target="_blank">(.*?)</a>.*"http://www\.sec\.state\.ma\.us/ele/eledist/reps11idx\.htm#[a-z]{1,13}[0-9]{0,2}" target="_blank">(.*?)</a>.*\z

The only (intentional) differences are that in the Swift literal, all the Double-Quotes and Backslashes had to be escaped with a backslash and the TextWrangler pattern starts with (?s) which is the equivalent of NSRegularExpressionOptions.DotMatchesLineSeparators.

I wanted to use regex1 to modify responseString as follows

responseString.replaceMatchesInString(options: nil, range: NSMakeRange(0, responseString.length), withTemplate template: "$1\t$2\t$3")

But that didn't work either.

I naively thought that since I've been using regular expressions for 30 years, that part would be easy. Apparently not.


Your regex1 is missing double escapes on the literal dots (see www\.sec\.state\.ma\.us).

The correct regex1 declaration will be

@"\\A.*<b>District Representatives:</b>.*href=\"http://www\\.sec\\.state\\.ma\\.us/ele/eledist/con11idx\\.htm#D[1-9]\" target=\"_blank\">(.*?)</a>.*href=\"http://www\\.sec\\.state\\.ma\\.us/ele/eledist/sen11idx\\.htm#[0-9]{0,5}[a-z]{1,20}\" target=\"_blank\">(.*?)</a>.*\"http://www\\.sec\\.state\\.ma\\.us/ele/eledist/reps11idx\\.htm#[a-z]{1,13}[0-9]{0,2}\" target=\"_blank\">(.*?)</a>.*\\z"

You get Use of unresolved identifier responseString probably because you declared responseString outside the method where you declare and use numberOfMatches.

Category:regex Time:2018-09-15 Views:0
Tags: regex cocoa swift

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