test: use `RegExp.escape` to improve test reliability #1045

Job	Run time
Build slim tarball	1m 34s
x86_64-linux: with shared libraries	26m 41s
aarch64-linux: with shared libraries	26m 38s
x86_64-darwin: with shared libraries	26m 51s
aarch64-darwin: with shared libraries	26m 48s
	1h 48m 32s

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