test: use `RegExp.escape` to improve test reliability #1048

Job	Run time
Build slim tarball	1m 20s
aarch64-linux: with shared libraries	1h 57m 11s
x86_64-darwin: with shared libraries	3h 7m 27s
aarch64-darwin: with shared libraries	2h 20m 29s
x86_64-linux: with shared libraries	2h 6m 50s
	9h 33m 17s

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