Valid chat message characters

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SendChatMessage(msg [, chatType, languageID, target]) does not permit all possible characters (or 'bytes', to be precise) without potentially throwing an error or disconnecting the player.

ID	Printout†ChatFrame:AddMessage(strchar(ID))	Permitted	Remarks
0	none (terminates string)	❌	Silently ignored (ie, no message sent)
1 - 9		✔️
10	new line (line feed)	❌	DISCONNECT
11 - 12		✔️
13	new line (carriage return)	✔️
14 - 31		✔️
32 - 123	standard ASCII	✔️	The client applies chat substitutions to %t, %f and other codes
124	|	❌	ERROR "invalid escape code in chat message", also observed causing disconnects as of 3.1.3
125 - 126	standard ASCII	✔️
127		✔️
128 - 255		❌	ERROR "chat message must be UTF-8 text" possible

See also

• strchar(charID) constructs a single character from its decimal representation
• strbyte(text[, index]) returns the decimal byte representation of a single character