RegEx not matched due to extended Unicode characters

[kapfab]

When a string contains extended Unicode characters (like emojis), RegEx are not applied to its entirety.
This is usually unnoticed but when you try to match something at the very end of a string containing emojis, you can spend hours trying to find an issue in your RegEx…

This is probably linked to the NSString/String mapping used for Swift RegEx functions, explained here:
https://stackoverflow.com/questions/29756530/swift-regex-matching-fails-when-source-contains-unicode-characters

Replacing the few occurrences of

    let range = GroupRange(location: 0, length: source.characters.count)

by

    let range = GroupRange(location: 0, length: (source as NSString).length)

seems to make everything working fine.

[kengruven]

My understanding is that .characters (a String.CharacterView) is extended grapheme clusters, while NSRegularExpression expects an NSRange in terms of UTF-16 code units.

Using source.utf16.count should also work.

[ypopovych]

Should be fixed now