underscore as route variable does not work

[wichert]

I have a configured route which uses a very minimal variable name:

config.add_route('retailer-view-feed-view-update',
        '/retailers/{_:\d+}/feed/{feed_id:\d+}/update/{id:\d+}',
        factory='s4u.dataentry.ui.factories.feed')

When using request.route_url to generate a URL for that route the _ variable is not expanded. Instead the resulting URL looks like this: http://localhost:5000/retailers/%7B_:/d+%7D/feed/1/update/18

[mcdonc]

I looked at the code, and this is indeed true. The pattern used to match dynamic parts is effectively

(\{[a-zA-Z][^\}]*\})

This isn't spelled out very well in the docs though. I'm apt to just allow underscore too, and indicate that
the name between the squigglies can start with a-z or _.

[wichert]

Works for me, thanks!