add basic email parsing regex

src/json_schema/parsing.rs

@@ -61,12 +61,19 @@ impl<'a> Parser<'a> {
             Value::Object(obj) if obj.contains_key("const") => self.parse_const(obj),
             Value::Object(obj) if obj.contains_key("$ref") => self.parse_ref(obj),
             Value::Object(obj) if obj.contains_key("type") => self.parse_type(obj),
+            Value::Object(obj) if obj.contains_key("format") && obj["format"] == "email" => self.parse_email(),
             json => Err(JsonSchemaParserError::UnsupportedJsonSchema(Box::new(
                 json.clone(),
             ))),
         }
     }
 
+    pub fn parse_email(&self) -> Result<String> {
+        // A common email regex pattern
+        let regex_pattern = r"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$";
+        Ok(regex_pattern.to_string())
+    }
+
     fn parse_empty_object(&mut self) -> Result<String> {
         // JSON Schema Spec: Empty object means unconstrained, any json type is legal
         let types = vec![