Fix invalid escape sequence in regex (#365) #262

Job	Run time
test (ubuntu-20.04, 3.7)	34s
test (ubuntu-20.04, 3.8)	25s
test (ubuntu-20.04, 3.9)	29s
test (ubuntu-20.04, 3.10)	28s
test (ubuntu-20.04, 3.11)	29s
test (ubuntu-20.04, 3.12)	45s
test (ubuntu-20.04, pypy3.8)	1m 24s
test (ubuntu-20.04, pypy3.9)	1m 5s
test (ubuntu-20.04, pypy3.10)	1m 6s
test (ubuntu-22.04, 3.7)	35s
test (ubuntu-22.04, 3.8)	27s
test (ubuntu-22.04, 3.9)	29s
test (ubuntu-22.04, 3.10)	34s
test (ubuntu-22.04, 3.11)	34s
test (ubuntu-22.04, 3.12)	32s
test (ubuntu-22.04, pypy3.8)	1m 18s
test (ubuntu-22.04, pypy3.9)	42s
test (ubuntu-22.04, pypy3.10)	46s
test (macos-13, 3.7)	1m 19s
test (macos-13, 3.8)	1m 8s
test (macos-13, 3.9)	1m 7s
test (macos-13, 3.10)	1m 7s
test (macos-13, 3.11)	1m 7s
test (macos-13, 3.12)	1m 4s
test (macos-13, pypy3.8)	1m 22s
test (macos-13, pypy3.9)	1m 26s
test (macos-13, pypy3.10)	1m 21s
test (windows-2022, 3.7)	1m 44s
test (windows-2022, 3.8)	1m 45s
test (windows-2022, 3.9)	2m 22s
test (windows-2022, 3.10)	2m 25s
test (windows-2022, 3.11)	1m 54s
test (windows-2022, 3.12)	2m 17s
test (windows-2022, pypy3.8)	2m 35s
test (windows-2022, pypy3.9)	2m 3s
test (windows-2022, pypy3.10)	2m 37s
builder_pypandoc	6s
builder_pypandoc_binary (macos-14)	1m 31s
builder_pypandoc_binary (windows-2022)	1m 52s
builder_pypandoc_binary (ubuntu-22.04)	4m 49s
publisher_latest	17s
publisher_release	0s
	52m 0s

Provide feedback