iregex doesn't work properly

Hi,

Someone please, help to resolve my problem with iregex !

using Django 1.9
mysql Server version: 5.7.13-0ubuntu0.16.04.2 (Ubuntu)
python 2.7

I got the record in mysql in table Order_process:

+-----+------+---------------------------+---------------------+----------+------------+
| id  | step | step_description          | date_step           | order_id | manager_id |
+-----+------+---------------------------+---------------------+----------+------------+
| 241 |    1 | заказ роутера             | 2016-08-21 11:03:16 |      170 |          1 |
+-----+------+---------------------------+---------------------+----------+------------+
 
next, I'd like to get thi record by queryset:
    str_iregex = '^заказ роутер.$'
    orders = Order_process.objects.filter(step_description__iregex = str_iregex , step = 1).order_by('-id')

But the got no result.
pls help

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