Hello, I just note that Ruby supports any character as delimiter.

See "General Delimited Input" chapter in http://ruby-doc.com/docs/ProgrammingRuby/

Typically '!', '#' are usable too.

I can add a few more bit I don't think @asterite wanted to allow every character as a delimiter. Thoughts?

I think with just | we are done. I see no reason to support other delimiters. For example Elixir supports the same as Crystal. As always, copying Ruby is not what we should always do. Having more things to write a same concept is worse that having just a few ways (less things to learn). I also never saw something like %*hello* in Ruby, even though it's possible, it will only bring confusion.