simplify regex and use semver pkg #29

	name: Build and tests
	on:
	# run tests on push to master, but not when other branches are pushed to
	push:
	branches:
	- master

	# run tests for all pull requests
	pull_request:

	jobs:
	build:
	strategy:
	matrix:
	include:
	- go: 1.21.x
	- go: 1.15.x

	name: Build Go ${{ matrix.go }}
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go ${{ matrix.go }}
	uses: actions/setup-go@v4
	with:
	go-version: ${{ matrix.go }}

	- name: Check out code
	uses: actions/checkout@v4

	- name: Build
	run: \|
	go build

	- name: Run Tests
	run: \|
	go test ./...

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