Update regex for wildcard blitz route in webpack config (#3843)

* update regex for wildcard blitz route in webpack config

* Create itchy-spoons-tan.md

* fix regex

* Update itchy-spoons-tan.md

.changeset/itchy-spoons-tan.md

@@ -0,0 +1,6 @@
+---
+"@blitzjs/rpc": patch
+"blitz": patch
+---
+
+Allow for custom page extensions for the wildcard blitz route. For example [...blitz].api.ts. For more information vist https://nextjs.org/docs/api-reference/next.config.js/custom-page-extensions

packages/blitz-rpc/src/index-server.ts

@@ -88,7 +88,7 @@ export function installWebpackConfig({
   webpackConfig.resolve.alias["npm-which"] = false
   webpackConfig.resolve.alias["cross-spawn"] = false
   webpackConfig.module.rules.push({
-    test: /[\\/]\[\[\.\.\.blitz]]\.[jt]sx?$/,
+    test: /[\\/]\[\[\.\.\.blitz]]?.+\.[jt]sx?$/,
     use: [
       {
         loader: loaderServer,