diff --git a/locales/en.json b/locales/en.json
index 713f1ee41..605d7633e 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -309,6 +309,7 @@
     "hook_name_unknown": "Unknown hook name '{name:s}'",
     "installation_complete": "Installation completed",
     "installation_failed": "Something went wrong with the installation",
+    "invalid_regex": "Invalid regex :'{regex:s}'",
     "ip6tables_unavailable": "You cannot play with ip6tables here. You are either in a container or your kernel does not support it",
     "iptables_unavailable": "You cannot play with iptables here. You are either in a container or your kernel does not support it",
     "log_corrupted_md_file": "The YAML metadata file associated with logs is damaged: '{md_file}\nError: {error}'",
@@ -498,6 +499,7 @@
     "regenconf_dry_pending_applying": "Checking pending configuration which would have been applied for category '{category}'…",
     "regenconf_failed": "Could not regenerate the configuration for category(s): {categories}",
     "regenconf_pending_applying": "Applying pending configuration for category '{category}'…",
+    "regex_with_only_domain": "You can't use a regex for domain, only for path",
     "restore_already_installed_app": "An app with the ID '{app:s}' is already installed",
     "restore_app_failed": "Could not restore the app '{app:s}'",
     "restore_cleaning_failed": "Could not clean up the temporary restoration directory",
diff --git a/src/yunohost/domain.py b/src/yunohost/domain.py
index 456dfa4bf..d1a621615 100644
--- a/src/yunohost/domain.py
+++ b/src/yunohost/domain.py
@@ -396,6 +396,71 @@ def _normalize_domain_path(domain, path):
     return domain, path
 
 
+def _check_and_normalize_permission_path(url):
+    """
+    Check and normalize the urls passed for all permissions
+    Also check that the Regex is valid
+
+    As documented in the 'ynh_permission_create' helper:
+
+    If provided, 'url' is assumed to be relative to the app domain/path if they
+    start with '/'.  For example:
+       /                             -> domain.tld/app
+       /admin                        -> domain.tld/app/admin
+       domain.tld/app/api            -> domain.tld/app/api
+       domain.tld                    -> domain.tld
+
+    'url' can be later treated as a regex if it starts with "re:".
+    For example:
+       re:/api/[A-Z]*$               -> domain.tld/app/api/[A-Z]*$
+       re:domain.tld/app/api/[A-Z]*$ -> domain.tld/app/api/[A-Z]*$
+    """
+    import re, sre_constants
+
+    # Uri without domain
+    if url.startwith('re:/'):
+        regex = url[4:]
+        # check regex
+        try:
+            re.compile(regex)
+        except sre_constants.error:
+            raise YunohostError('invalid_regex', regex=regex)
+        return url
+
+    if url.startswith('/'):
+        return "/" + url.strip("/")
+
+    # Uri with domain
+    domains = domain_list()['domains']
+
+    if url.startwith('re:'):
+        if '/' not in url:
+            raise YunohostError('regex_with_only_domain')
+        domain = url[3:].split('/')[0]
+        path = url[3:].split('/', 1)[1]
+
+        if domain not in domains:
+            raise YunohostError('domain_unknown')
+
+        try:
+            re.compile(path)
+        except sre_constants.error:
+            raise YunohostError('invalid_regex', regex=path)
+
+        return 're:' + domain + path
+
+    else:
+        domain = url.split('/')[0]
+        if domain not in domains:
+            raise YunohostError('domain_unknown')
+
+        if '/' in url:
+            path = '/' + url.split('/', 1)[1].strip('/')
+            return domain + path
+        else:
+            return domain
+
+
 def _build_dns_conf(domain, ttl=3600):
     """
     Internal function that will returns a data structure containing the needed
diff --git a/src/yunohost/permission.py b/src/yunohost/permission.py
index b57534079..dace552f9 100644
--- a/src/yunohost/permission.py
+++ b/src/yunohost/permission.py
@@ -336,6 +336,7 @@ def permission_url(operation_logger, permission,
         clear_urls  -- (optional) Clean all urls (url and additional_urls)
     """
     from yunohost.utils.ldap import _get_ldap_interface
+    from yunohost.domain import _check_and_normalize_permission_path
     ldap = _get_ldap_interface()
 
     # By default, manipulate main permission
@@ -352,20 +353,22 @@ def permission_url(operation_logger, permission,
 
     if url is None:
         url = existing_permission["url"]
+    else:
+        url = _check_and_normalize_permission_path(url)
 
     current_additional_urls = existing_permission["additional_urls"]
     new_additional_urls = copy.copy(current_additional_urls)
 
     if add_url:
-        for url in add_url:
-            if url in current_additional_urls:
+        for ur in add_url:
+            if ur in current_additional_urls:
                 logger.warning(m18n.n('additional_urls_already_added', permission=permission, url=url))
             else:
-                new_additional_urls += [url]
+                new_additional_urls += [_check_and_normalize_permission_path(url)]
 
     if remove_url:
-        for url in remove_url:
-            if url not in current_additional_urls:
+        for ur in remove_url:
+            if ur not in current_additional_urls:
                 logger.warning(m18n.n('additional_urls_already_removed', permission=permission, url=url))
 
         new_additional_urls = [u for u in new_additional_urls if u not in remove_url]