added RegexFilter

Cargo.toml

@@ -5,6 +5,9 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+regex_filter = ["regex"]
+
 [dependencies]
 serde_json = "1.0.44"
 serde = { version = "1.0.101", features = ["derive"] }
@@ -23,4 +26,6 @@ futures = "0.3.1"
 pin-project = "0.4.6"
 serde_with_macros = "1.0.1"
 either = "1.5.3"
-mime = "0.3.16"
+mime = "0.3.16"
+
+regex = {version = "1.3.3", optional = true}

src/dispatching/filters/mod.rs

@@ -2,6 +2,8 @@
 
 pub use main::*;
 
+#[cfg(feature = "regex_filter")]
+pub use regex_filter::*;
 pub use command::*;
 pub use message_caption::*;
 pub use message_text::*;
@@ -13,3 +15,6 @@ mod command;
 mod message_caption;
 mod message_text;
 mod message_text_caption;
+#[cfg(feature = "regex_filter")]
+mod regex_filter;
+

src/dispatching/filters/regex_filter.rs

@@ -0,0 +1,73 @@
+use regex::Regex;
+use crate::dispatching::Filter;
+use crate::types::Message;
+
+// TODO: docs
+pub struct RegexFilter {
+    regexp: Regex
+}
+
+impl Filter<Message> for RegexFilter {
+    fn test(&self, value: &Message) -> bool {
+        self.regexp.is_match(value.text()?)
+    }
+}
+
+impl RegexFilter {
+    pub fn new(regexp: Regex) -> Self {
+        Self {
+            regexp
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::types::{
+        Chat, ChatKind, ForwardKind, MediaKind, MessageKind, Sender, User,
+    };
+
+    #[test]
+    fn match_true() {
+        let filter = RegexFilter::new(Regex::new(r"\w+").unwrap());
+        let message = create_message_with_text("text".to_string());
+        assert!(filter.test(&message));
+    }
+
+    fn create_message_with_text(text: String) -> Message {
+        Message {
+            id: 0,
+            date: 0,
+            chat: Chat {
+                id: 0,
+                kind: ChatKind::Private {
+                    type_: (),
+                    username: None,
+                    first_name: None,
+                    last_name: None,
+                },
+                photo: None,
+            },
+            kind: MessageKind::Common {
+                from: Sender::User(User {
+                    id: 0,
+                    is_bot: false,
+                    first_name: "".to_string(),
+                    last_name: None,
+                    username: None,
+                    language_code: None,
+                }),
+                forward_kind: ForwardKind::Origin {
+                    reply_to_message: None,
+                },
+                edit_date: None,
+                media_kind: MediaKind::Text {
+                    text,
+                    entities: vec![],
+                },
+                reply_markup: None,
+            },
+        }
+    }
+}