Unicode for emoji - string concatenation

+U274c is represented by these 3 bytes in utf8: 0xE2 0x9D 0x8C.

If your terminal doesn’t support utf8, then you should probably inspect on a byte level rather than printed representation.

As you have not specified your terminals encoding, basically everything can be triggered by these bytes.

Assuming latin-X, which is often used in the windows world, then the 8x and 9x bytes are not used and can cause weirdnesses.

iex> << 0x1F517 :: utf8 >>
"🔗"

iex> << 0xF0, 0x9F, 0x94, 0x97 >>
"🔗"

iex> << 0xF0, 0x9F, 0x94, 0x97>> == << 0x1f517 :: utf8 >>
true

d8 3d dd 17 is the UTF16 representation. Elixir is a UTF8 language where the encoding is f0 9f 94 97.

With a little bit of erlang magic:

iex> :erlang.binary_to_list << 0x1f517 :: utf8 >>       
[240, 159, 148, 151]

I have a unicode library that examines code points. For example:

iex> Unicode.category << 0x1F49A :: utf8 >>             
[:So]
iex> Unicode.properties << 0x1F49A :: utf8 >>                                                                          
[[:emoji, :grapheme_base]]

Unfortunately the Regex module doesn’t support the Unicode character class [:So:]. Or any other Unicode character classes. I have another lib unicode_set that has some support for Unicode character classes. But regexes not yet - soon though.