feat: add emoji

crates/delta/src/util/regex.rs

@@ -7,3 +7,8 @@ use regex::Regex;
 /// Block lookalike characters
 pub static RE_USERNAME: Lazy<Regex> =
     Lazy::new(|| Regex::new(r"^[^\u200BА-Яа-яΑ-Ωα-ω@#:\n\r\[\]]+$").unwrap());
+
+/// Regex for valid emoji names
+///
+/// Alphanumeric and underscores
+pub static RE_EMOJI: Lazy<Regex> = Lazy::new(|| Regex::new(r"^[a-zA-Z0-9_]+$").unwrap());