Swift regex: does a string match a pattern?

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Swift version 3 solution:

if string.range(of: regex, options: .regularExpression, range: nil, locale: nil) != nil ...

Swift version 2 solution:

if string.rangeOfString(pattern, options: .RegularExpressionSearch) != nil ...

Example — does this string contain two letter “o” characters?

"hello world".rangeOfString("o.*o", options: .RegularExpressionSearch) != nil

Note: If you get the error message 'String' does not have a member 'rangeOfString', then add this before: import Foundation. This is because
Foundation provides the NSString methods that are automatically bridged to the Swift String class.

import Foundation

Thanks to Onno Eberhard for the Swift 3 update.

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