diff --git a/access.lua b/access.lua
index 8148874..cd32e0b 100644
--- a/access.lua
+++ b/access.lua
@@ -22,6 +22,9 @@ local conf = config.get_config()
 -- Import helpers
 local hlp = require "helpers"
 
+-- Import Perl regular expressions library
+local rex = require "rex_pcre"
+
 -- Just a note for the client to know that he passed through the SSO
 ngx.header["X-SSO-WAT"] = "You've just been SSOed"
 
@@ -185,6 +188,12 @@ end
 -- If the URL matches one of the `redirected_urls` in the configuration file,
 -- just redirect to the target URL/URI
 --
+function match(s, regex)
+    if rex.match(s, regex) or string.match(s,regex) then
+        return true
+    end
+    return false
+end
 
 function detect_redirection(redirect_url)
     if hlp.string.starts(redirect_url, "http://")
@@ -209,9 +218,9 @@ end
 
 if conf["redirected_regex"] then
     for regex, redirect_url in pairs(conf["redirected_regex"]) do
-        if string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
-        or string.match(ngx.var.scheme.."://"..ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
-        or string.match(ngx.var.uri..hlp.uri_args_string(), regex) then
+        if match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
+        or match(ngx.var.scheme.."://"..ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
+        or match(ngx.var.uri..hlp.uri_args_string(), regex) then
             detect_redirection(redirect_url)
         end
     end
@@ -242,8 +251,8 @@ function is_protected()
         end
     end
     for _, regex in ipairs(conf["protected_regex"]) do
-        if string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
-        or string.match(ngx.var.uri..hlp.uri_args_string(), regex) then
+        if match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
+        or match(ngx.var.uri..hlp.uri_args_string(), regex) then
             return true
         end
     end
@@ -272,8 +281,8 @@ end
 
 if conf["skipped_regex"] then
     for _, regex in ipairs(conf["skipped_regex"]) do
-        if (string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
-        or  string.match(ngx.var.uri..hlp.uri_args_string(), regex))
+        if (match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
+        or  match(ngx.var.uri..hlp.uri_args_string(), regex))
         and not is_protected() then
             return hlp.pass()
         end
@@ -341,8 +350,8 @@ end
 
 if conf["unprotected_regex"] then
     for _, regex in ipairs(conf["unprotected_regex"]) do
-        if (string.match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
-        or  string.match(ngx.var.uri..hlp.uri_args_string(), regex))
+        if (match(ngx.var.host..ngx.var.uri..hlp.uri_args_string(), regex)
+        or  match(ngx.var.uri..hlp.uri_args_string(), regex))
         and not is_protected() then
             if hlp.is_logged_in() then
                 hlp.set_headers()