[BUG]: Phalcon route Exception when uri contains arabic letters

[ajaajaaMohameda]

Describe the bug
Hello, we are working on a project where we have to search using arabic letters, when we have a uri like this one: "/client/محمد" the notFoundHandler get executed which means the route was not matched

To Reproduce

use Phalcon\Di\FactoryDefault;
use Phalcon\Mvc\Micro;

$container = new FactoryDefault();

$application = new Micro($container);

$application->get(
    "/client/{search:\p{Xan}{0,20}}",
    function ($search) {
        echo "Welcome $search!";
    }
);

$application->notFound(function () use ($application) {
    echo "the route was not matched";
    var_dump($application->router->getRoutes()[0]->getCompiledPattern());
});

$application->handle(urldecode($_SERVER["REQUEST_URI"]));

Expected behavior
given the regular expression we use, the route must match if the uri is "/client/محمد"

Details

• Phalcon version:

phalcon
Phalcon is a full stack PHP framework, delivered as a PHP extension, offering lower resource consumption and high performance.
phalcon => enabled
Author => Phalcon Team and contributors
Version => 4.0.6
Build Date => Jun 12 2020 08:14:19
Powered by Zephir => Version 0.12.17-6724dbf

Directive => Local Value => Master Value
phalcon.db.escape_identifiers => On => On
phalcon.db.force_casting => Off => Off
phalcon.orm.case_insensitive_column_map => Off => Off
phalcon.orm.cast_last_insert_id_to_int => Off => Off
phalcon.orm.cast_on_hydrate => Off => Off
phalcon.orm.column_renaming => On => On
phalcon.orm.disable_assign_setters => Off => Off
phalcon.orm.enable_implicit_joins => On => On
phalcon.orm.enable_literals => On => On
phalcon.orm.events => On => On
phalcon.orm.exception_on_failed_save => Off => Off
phalcon.orm.exception_on_failed_metadata_save => On => On
phalcon.orm.ignore_unknown_columns => Off => Off
phalcon.orm.late_state_binding => Off => Off
phalcon.orm.not_null_validations => On => On
phalcon.orm.update_snapshot_on_save => On => On
phalcon.orm.virtual_foreign_keys => On => On
phalcon.warning.enable => On => On

• PHP Version:

PHP 7.2.31 (cli) (built: Jun  9 2020 15:16:26) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Xdebug v2.9.6, Copyright (c) 2002-2020, by Derick Rethans

• Operating System:
  Kubuntu 18.04
• Installation type: installing via package manager
• Server: Apache

Additional context
We took a look at the phalcon github repository and we found the compilePattern (string! pattern) function which is located in https://github.com/phalcon/cphalcon/blob/master/phalcon/Cli/Router/Route.zep does not add the unicode regex delimiters 'u',

/**
* Replaces placeholders from pattern returning a valid PCRE regular
* expression
*/
public function compilePattern(string! pattern) -> string
{
.....
/**
* Check if the pattern has parentheses or square brackets in order to
* add the regex delimiters
*/
**if memstr(pattern, "(") || memstr(pattern, "[") {
return "#^" . pattern . "$#";
}**

return pattern;
}

however in older versions like https://github.com/phalcon/cphalcon/blob/3.4.x/phalcon/mvc/router/route.zep it does

  /**
* Replaces placeholders from pattern returning a valid PCRE regular expression
*/
public function compilePattern(string! pattern) -> string
{
..................

// Check if the pattern has parentheses in order to add the regex delimiters
if memstr(pattern, "(") {
return "#^" . pattern . "$#u";
}

// Square brackets are also checked
if memstr(pattern, "[") {
return "#^" . pattern . "$#u";
}

return pattern;
}

[zsilbi]

Fixed in #15162