diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0675274..e829408 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 ### Fixed
 
 - changed `$asset->url` to `$asset->getImageTransformSourcePath()` ([#3](https://github.com/codewithkyle/craft-jitter/issues/3))
+- changed file extension regex pattern from `/(\..*)$/` to `/(\..{1,4})$/` ([#3](https://github.com/codewithkyle/craft-jitter/issues/3))
 
 ## [1.1.0] - 2020-10-26
 
diff --git a/src/services/Transform.php b/src/services/Transform.php
index bfdbcff..399887d 100644
--- a/src/services/Transform.php
+++ b/src/services/Transform.php
@@ -173,13 +173,13 @@ public function transformImage(array $params, bool $clientAcceptsWebp): array
             $masterImage = $params['path'];
         }
 
-        preg_match("/(\..*)$/", $asset->filename, $matches);
+        preg_match("/(\..{1,4})$/", $asset->filename, $matches);
         $baseType = strtolower(ltrim($matches[0], "."));
 
         // Build transform details
         $transform = $this->getImageTransformSettings($params, $masterImage, $asset);
         $uid = $this->buildTransformUid($transform);
-        $filename = preg_replace("/(\..*)$/", '', $asset->filename) . '-' . $uid;
+        $filename = preg_replace("/(\..{1,4})$/", '', $asset->filename) . '-' . $uid;
 
         // Create S3 client (if possible)
         $settings = [];
@@ -225,7 +225,7 @@ public function transformImage(array $params, bool $clientAcceptsWebp): array
                 $cleanName = preg_replace("/.*\//", '', $cleanName);
                 $response['url'] = "/jitter/" . $cleanName;
                 $response['type'] = 'local';
-                preg_match("/(\..*)$/", $existingFile, $matches);
+                preg_match("/(\..{1,4})$/", $existingFile, $matches);
                 $contentType = ltrim($matches[0], ".");
                 switch ($contentType)
                 {
@@ -253,7 +253,7 @@ public function transformImage(array $params, bool $clientAcceptsWebp): array
         // Save the output
         if ($s3)
         {
-            preg_match("/(\..*)$/", $finalImage, $matches);
+            preg_match("/(\..{1,4})$/", $finalImage, $matches);
             $finalImageType = $matches[0];
             $uri = "/" . str_replace('\\', '/', $finalImage);
             $uri = preg_replace("/.*\//", '', $uri);
@@ -288,7 +288,7 @@ public function transformImage(array $params, bool $clientAcceptsWebp): array
             copy($finalImage, FileHelper::normalizePath($publicPath. DIRECTORY_SEPARATOR  . $cleanName));
             $response['url'] = "/jitter/" . $cleanName;
             $response['type'] = 'local';
-            preg_match("/(\..*)$/", $finalImage, $matches);
+            preg_match("/(\..{1,4})$/", $finalImage, $matches);
             $contentType = ltrim($matches[0], ".");
             switch ($contentType)
             {