Don't store sub-groups where not needed in regex and other processing optimisations #141

	name: "Corpus regressions"
	on: pull_request

	jobs:
	regression:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: "3.x"
	- name: Install dependencies
	run: \|
	sudo apt update && sudo apt install -y python3-graphviz
	python -m pip install --upgrade pip
	pip install .[tests]
	pip install pytest-xdist fypp
	- name: Test known repos
	run: \|
	pytest -n auto -m slow -vv

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