Answer by Wiktor Stribiżew for Getting img url from RSS feed swift

You should consume as many characters up to the src attribute as possible. You can do it with .*?:

var regex: NSRegularExpression = NSRegularExpression(pattern: "<img.*?src=\"([^\"]*)\"", options: .CaseInsensitive, error: nil)!

Also, you can use the sample from Ross' iOS Swift blog

import Foundationextension String {    func firstMatchIn(string: NSString!, atRangeIndex: Int!) -> String {        var error : NSError?        let re = NSRegularExpression(pattern: self, options: .CaseInsensitive, error: &error)        let match = re.firstMatchInString(string, options: .WithoutAnchoringBounds, range: NSMakeRange(0, string.length))        return string.substringWithRange(match.rangeAtIndex(atRangeIndex))    }}

And in your calling code:

var result = "<img.*?src=\"([^\"]*)\"".firstMatchIn(elementString, atRangeIndex: 1)

To make sure . matches newline, use options: NSRegularExpressionOptions.DotMatchesLineSeparators.