Correctly detect filters with non-word params

[cattekin]

Change the filter regex to return valid filter matches when the filter attribute isn't an ascii word object.

This fixes #2228 as well as allowing using comma separated values when filtering

It shouldn't matter when checking for the existence of a filter whether the characters to the right of the : in the word object contain things like unicode characters or punctuation.

[jubilee2]

can you explain more? I do not see related between this and #2252

[cattekin]

can you explain more? I do not see related between this and #2252

sorry, somehow messed up the pasting the issue, the correct one is https://github.com/thoughtbot/administrate/issues/2228

[pablobm]

Looks good. Thank you!

[jubilee2]

it's should fixed for #2265