tg://user?id=<user_id>can be used to mention a user by their ID without using a username. Please note:
codeentities, all '`' and '\' characters must be escaped with a preceding '\' character.
(...)part of inline link definition, all ')' and '\' must be escaped with a preceding '\' character.
__is always greadily treated from left to right as beginning or end of
underlineentity, so instead of
___italic underline_\r__, where
\ris a character with code 13, which will be ignored.
&symbols that are not a part of a tag or an HTML entity must be replaced with the corresponding HTML entities (
codetags, to define programming language for