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Perl has some similar features and they tend to make syntax highlighting and editor support more difficult. Will that be a problem with swift?

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Ruby string interpolation (might be the exact same as Perl): %[string] or %^string^ or %(string), etc. Basically % followed by any pair of the same character around a string works.

https://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Litera...

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