Fix router matching for underscored route params

services/nginx/app/classes/router.php

@@ -89,7 +89,7 @@ class router
         }
         // Regex
         $route = str_replace('/', '\/', $route);
-        $route = preg_replace('/{[a-zA-Z0-9]+}/', '([a-zA-Z0-9]+)', $route);
+        $route = preg_replace('/{[a-zA-Z0-9_]+}/', '([a-zA-Z0-9]+)', $route);
         if (preg_match('/^' . $route . '$/', $this->url)) {
             return true;
         }

services/nginx/app/tests/Unit/Router/RouterDynamicSegmentTest.php

@@ -0,0 +1,16 @@
+<?php
+
+use classes\router;
+
+it('matches dynamic route parameter names containing underscores', function (): void {
+    $_SERVER['REQUEST_URI'] = '/modules/self-serve/lane/hardware/batch/916cdba1981e52f3dc728ea06fc39cf0';
+    $_SERVER['REQUEST_METHOD'] = 'GET';
+
+    $router = new router();
+    $matcher = new ReflectionMethod(router::class, 'doesRouteMatchCurrent');
+
+    expect($matcher->invoke(
+        $router,
+        '/modules/self-serve/lane/hardware/batch/{batch_id}'
+    ))->toBeTrue();
+});