diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index dfe0d9f5..4e99d769 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -26,75 +26,3 @@ jobs:
         run: |
           python setup.py sdist bdist_wheel
           twine upload dist/*
-  feedstock:
-    needs: build
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v1
-        with:
-          python-version: 3.8
-      - name: Checkout flask-restx code
-        uses: actions/checkout@v2
-        with:
-          path: base
-      - name: Checkout flask-restx-feedstock code
-        uses: actions/checkout@v2
-        with:
-          repository: python-restx/flask-restx-feedstock.git
-          path: feedstock
-          token: ${{ secrets.BOT_TOKEN }}
-      - name: Set Variables
-        id: vars
-        run: |
-          echo "::set-output name=version::$(echo ${{ github.ref }} | cut -d'/' -f3)"
-      - name: Create a release branch
-        run: |
-          cd feedstock
-          git remote add forge https://github.com/conda-forge/flask-restx-feedstock.git
-          git fetch forge
-          git checkout forge/master -b release-${{ steps.vars.outputs.version }}
-      - name: Update meta.yml
-        shell: python
-        run: |
-          from http import client
-          from pkg_resources import parse_requirements
-          import re
-          VERSION = "${{ steps.vars.outputs.version }}"
-          with open("feedstock/recipe/meta.yaml") as f:
-              meta = f.read()
-          requirements = []
-          with open("base/requirements/install.pip") as f:
-              for req in parse_requirements(f):
-                  name = req.project_name
-                  versions = ",".join(["".join(spec) for spec in req.specs])
-                  if versions:
-                      name += " " + versions
-                  requirements.append(name)
-          requirements = '"' + '", "'.join(requirements) + '"'
-          conn = client.HTTPSConnection("pypi.org")
-          conn.request("GET", "/simple/flask-restx/")
-          resp = conn.getresponse()
-          content = str(resp.read(), "utf-8")
-          conn.close()
-          m = re.findall(r'flask-restx-%s.tar.gz#sha256=([A-Za-z0-9]+)"' % VERSION, content)
-          if not m:
-              raise Exception("sha256 not found in: %s" % content)
-          sha256 = m[0]
-          meta = re.sub(r'({% set version = )".+"( %})', r'\1"%s"\2' % VERSION, meta)
-          meta = re.sub(r'({% set sha256 = )".+"( %})', r'\1"%s"\2' % sha256, meta)
-          meta = re.sub(r"({% set requirements = \[).+(] %})", r"\1%s\2" % requirements, meta)
-          meta = re.sub(r"(number:) \d+", r"\1 0", meta)
-          with open("feedstock/recipe/meta.yaml", "w") as f:
-              f.write(meta)
-      - name: Push
-        run: |
-          cd feedstock
-          git config user.name "${{ secrets.BOT_USERNAME }}"
-          git config user.email "python.restx.bot@gmail.com"
-          git add recipe/meta.yaml
-          git commit -m"Release version ${{ steps.vars.outputs.version }}"
-          git push origin release-${{ steps.vars.outputs.version }}
-      - name: Create Pull Request
-        run: |
-          curl --fail -u ${{ secrets.BOT_USERNAME }}:${{ secrets.BOT_TOKEN }} https://api.github.com/repos/conda-forge/flask-restx-feedstock/pulls -d '{"title": "Release version ${{ steps.vars.outputs.version }}", "head": "python-restx:release-${{ steps.vars.outputs.version }}", "base": "master", "maintainer_can_modify": true}'
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 798834ed..8f47784f 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -25,6 +25,19 @@ Releases prior to 0.3.0 were “best effort” filled out, but are missing
 some info. If you see your contribution missing info, please open a PR
 on the Changelog!
 
+.. _section-0.5.1:
+0.5.1
+-----
+
+.. _bug_fixes-0.5.1
+
+Bug Fixes
+~~~~~~~~~
+
+::
+
+   * Optimize email regex (#372) [kevinbackhouse]
+
 .. _section-0.5.0:
 0.5.0
 -----
diff --git a/examples/zoo_app/requirements.txt b/examples/zoo_app/requirements.txt
index a72bb41d..4ba87b60 100644
--- a/examples/zoo_app/requirements.txt
+++ b/examples/zoo_app/requirements.txt
@@ -2,7 +2,7 @@ aniso8601==9.0.1
 attrs==21.2.0
 click==7.1.2
 Flask==1.1.4
-flask-restx==0.4.0
+flask-restx==0.5.1
 itsdangerous==1.1.0
 Jinja2==2.11.3
 jsonschema==3.2.0
diff --git a/flask_restx/__about__.py b/flask_restx/__about__.py
index 1a9fbad8..c3c42221 100644
--- a/flask_restx/__about__.py
+++ b/flask_restx/__about__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-__version__ = "0.5.1.dev"
+__version__ = "0.5.2.dev"
 __description__ = (
     "Fully featured framework for fast, easy and documented API development with Flask"
 )
diff --git a/flask_restx/api.py b/flask_restx/api.py
index 60157088..f89deeb8 100644
--- a/flask_restx/api.py
+++ b/flask_restx/api.py
@@ -106,6 +106,7 @@ class Api(object):
     :param url_scheme: If set to a string (e.g. http, https), then the specs_url and base_url will explicitly use this
         scheme regardless of how the application is deployed. This is necessary for some deployments behind a reverse
         proxy.
+    :param str default_swagger_filename: The default swagger filename.
     """
 
     def __init__(
@@ -136,6 +137,7 @@ def __init__(
         serve_challenge_on_401=False,
         format_checker=None,
         url_scheme=None,
+        default_swagger_filename="swagger.json",
         **kwargs
     ):
         self.version = version
@@ -166,6 +168,7 @@ def __init__(
         self._refresolver = None
         self.format_checker = format_checker
         self.namespaces = []
+        self.default_swagger_filename = default_swagger_filename
 
         self.ns_paths = dict()
 
@@ -308,7 +311,7 @@ def _register_specs(self, app_or_blueprint):
                 app_or_blueprint,
                 SwaggerView,
                 self.default_namespace,
-                "/swagger.json",
+                "/" + self.default_swagger_filename,
                 endpoint=endpoint,
                 resource_class_args=(self,),
             )
diff --git a/flask_restx/inputs.py b/flask_restx/inputs.py
index b05532f3..9c76d8a0 100644
--- a/flask_restx/inputs.py
+++ b/flask_restx/inputs.py
@@ -48,7 +48,7 @@ def my_type(value):
 
 
 email_regex = re.compile(
-    r"^" "(?P<local>[^@]*[^@.])" r"@" r"(?P<server>[^@]+(?:\.[^@]+)*)" r"$",
+    r"^" "(?P<local>[^@]*[^@.])" r"@" r"(?P<server>[^@\.]+(?:\.[^@\.]+)*)" r"$",
     re.IGNORECASE,
 )
 
diff --git a/tests/test_inputs.py b/tests/test_inputs.py
index 5a0133bc..9e705684 100644
--- a/tests/test_inputs.py
+++ b/tests/test_inputs.py
@@ -584,6 +584,8 @@ def test_valid_value_default(self, value):
             "me@::1",
             "me@200.8.9.10",
             "me@2001:db8:85a3::8a2e:370:7334",
+            "foo@bar.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?" +
+            ".?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?@",
         ],
     )
     def test_invalid_value_default(self, value):
diff --git a/tests/test_swagger.py b/tests/test_swagger.py
index f52748a9..8b7af715 100644
--- a/tests/test_swagger.py
+++ b/tests/test_swagger.py
@@ -3323,3 +3323,25 @@ def get(self):
 
         path = data["paths"]["/with-parser/"]
         assert "parameters" not in path
+
+    def test_nondefault_swagger_filename(self, app, client):
+        api = restx.Api(doc="/doc/test", default_swagger_filename="test.json")
+        ns = restx.Namespace("ns1")
+
+        @ns.route("/test1")
+        class Ns(restx.Resource):
+            @ns.doc("Docs")
+            def get(self):
+                pass
+
+        api.add_namespace(ns)
+        api.init_app(app)
+
+        resp = client.get("/test.json")
+        assert resp.status_code == 200
+        assert resp.content_type == "application/json"
+        resp = client.get("/doc/test")
+        assert resp.status_code == 200
+        assert resp.content_type == "text/html; charset=utf-8"
+        resp = client.get("/ns1/test1")
+        assert resp.status_code == 200