Remove regular expression futurewarning

[soimkim]

Fixes #2746

Tasks

• Reviewed contribution guidelines
• PR is descriptively titled 📑 and links the original issue above 🔗
• Tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR
  Run tests locally to check for errors.
• Commits are in uniquely-named feature branch and has no merge conflicts 📁

[pombredanne]

Thank you ++
These are annoying alright!
(And happy new year!)

[soimkim]

Happy new year. 😄

[soimkim]

Dear @pombredanne ,
When will the next version of scancode-toolkit be released to pypi? 😃

[pombredanne]

@soimkim Hey!
this is happening just as we chat here!
I tagged a beta yesterday and I am in the process of publishing this beta release to GH and PyPI.
This is a beta1. I expect there will be a few extra beta releases over the next week or so and a few "rc" release candidates then

[pombredanne]

The goal of the betas is to make sure we can iron out all the small quirks that could be discovered.

[soimkim]

@pombredanne , awesome!
I look forward to the release of scancode-toolkit.