Pure Swift extension methods for getting substrings from RegularExpressionMatch.Range and Range<Int>

[cradnovich]

Previous example code (e.g., in the RegularExpressionTests) relied on NSString and NSRange to obtain the matching string or the captured groups.

For example:

let stringRange = NSRange(match.range)

let matchString = (string as NSString).substringWithRange(stringRange)

With this code, it can be shortened, with a pure Swift implementation:

let matchString = string.substring(match.range)

Also added a test case for emoji support in RegularExpression that uses these methods.

[colemancda]

Thanks :)

[cradnovich]

You're welcome 😄