diff --git a/src/config.rs b/src/config.rs
index 6d9d35a..c076280 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -12,7 +12,7 @@ use tracing::{error, info, instrument};
 #[derive(Deserialize, Serialize, Debug)]
 #[serde(untagged)]
 pub enum DomainMatcher {
-    Regex(#[serde(with = "regex")] Regex),
+    Regex(#[serde(with = "crate::regex")] Regex),
     Exact(String),
 }
 
@@ -125,48 +125,3 @@ pub async fn load() -> eyre::Result<Config> {
         },
     }
 }
-
-mod regex {
-    use fancy_regex::Regex;
-    use serde::{de::Visitor, Deserializer, Serialize, Serializer};
-
-    pub fn deserialize<'de, D>(d: D) -> Result<Regex, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        struct RegexVisitor;
-        impl Visitor<'_> for RegexVisitor {
-            type Value = Regex;
-
-            fn expecting(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-                write!(f, "a regex string starting and ending with slashes ('/')")
-            }
-
-            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-            where
-                E: serde::de::Error,
-            {
-                let v = v
-                    .strip_prefix('/')
-                    .and_then(|v| v.strip_suffix('/'))
-                    .ok_or(serde::de::Error::invalid_value(
-                        serde::de::Unexpected::Str(v),
-                        &self,
-                    ))?;
-
-                let regex = Regex::new(v);
-
-                regex.map_err(|err| serde::de::Error::custom(err))
-            }
-        }
-
-        d.deserialize_string(RegexVisitor)
-    }
-
-    pub fn serialize<S>(value: &Regex, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        value.as_str().serialize(serializer)
-    }
-}
diff --git a/src/main.rs b/src/main.rs
index bb2a648..1332baf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 #![feature(let_chains, io_error_more)]
 
 mod config;
+mod regex;
 mod update_repo;
 
 use std::sync::Arc;
diff --git a/src/regex.rs b/src/regex.rs
new file mode 100644
index 0000000..5b31c8f
--- /dev/null
+++ b/src/regex.rs
@@ -0,0 +1,42 @@
+use fancy_regex::Regex;
+use serde::{de::Visitor, Deserializer, Serialize, Serializer};
+
+pub fn deserialize<'de, D>(d: D) -> Result<Regex, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    struct RegexVisitor;
+    impl Visitor<'_> for RegexVisitor {
+        type Value = Regex;
+
+        fn expecting(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+            write!(f, "a regex string starting and ending with slashes ('/')")
+        }
+
+        fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+        where
+            E: serde::de::Error,
+        {
+            let v = v
+                .strip_prefix('/')
+                .and_then(|v| v.strip_suffix('/'))
+                .ok_or(serde::de::Error::invalid_value(
+                    serde::de::Unexpected::Str(v),
+                    &self,
+                ))?;
+
+            let regex = Regex::new(v);
+
+            regex.map_err(|err| serde::de::Error::custom(err))
+        }
+    }
+
+    d.deserialize_string(RegexVisitor)
+}
+
+pub fn serialize<S>(value: &Regex, serializer: S) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+{
+    value.as_str().serialize(serializer)
+}