Bug: 404 RoutingError when filling in the city field with "_" symbol

[owlscatcher]

Summary

When filling in the “city” field on the job search page, we get a RoutingError if the “_” character was entered in the field.

Reproduction steps

1. Go to https://cv.hexlet.io/ru/vacancies
2. Fill in the “city” field using underscores (for example: New_york)
3. Click search button
4. Get a 404 error, and a RoutingError on the backend

Expected result

List of ads with the corresponding city or “Empty”

Actual result

In a production environment:

In a dev environment:

Browsers

Firefox, Chrome

OS

Linux

[aelaa]

Underscores are used in search filtering, so we cannot distinguish it from the separator. Which character can be used as a separator instead of underscore better?