diff --git a/src/boxes/regex/mod.rs b/src/boxes/regex/mod.rs
index 3d52e803..eabd13d3 100644
--- a/src/boxes/regex/mod.rs
+++ b/src/boxes/regex/mod.rs
@@ -3,17 +3,65 @@
 // 参考: 既存Boxの設計思想
 
 use regex::Regex;
+use crate::box_trait::{NyashBox, StringBox, BoolBox};
+use std::any::Any;
+use std::fmt::Debug;
 
+#[derive(Debug, Clone)]
 pub struct RegexBox {
     pub regex: Regex,
+    id: u64,
+    pattern: String,
 }
 
 impl RegexBox {
     pub fn new(pattern: &str) -> Result<Self, regex::Error> {
+        static mut COUNTER: u64 = 0;
         let regex = Regex::new(pattern)?;
-        Ok(RegexBox { regex })
+        let id = unsafe {
+            COUNTER += 1;
+            COUNTER
+        };
+        Ok(RegexBox {
+            regex,
+            id,
+            pattern: pattern.to_string(),
+        })
     }
     pub fn is_match(&self, text: &str) -> bool {
         self.regex.is_match(text)
     }
+    pub fn pattern(&self) -> &str {
+        &self.pattern
+    }
+}
+
+impl NyashBox for RegexBox {
+    fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
+
+    fn to_string_box(&self) -> StringBox {
+        StringBox::new(format!("RegexBox({})", self.pattern))
+    }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+
+    fn type_name(&self) -> &'static str {
+        "RegexBox"
+    }
+
+    fn box_id(&self) -> u64 {
+        self.id
+    }
+
+    fn equals(&self, other: &dyn NyashBox) -> BoolBox {
+        if let Some(other_regex) = other.as_any().downcast_ref::<RegexBox>() {
+            BoolBox::new(self.pattern == other_regex.pattern)
+        } else {
+            BoolBox::new(false)
+        }
+    }
 }