Fix regular expression to remove shell evaluation in case nested parentheses. #47
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I faced a build error in github actions of another project for Ruby 2.4 (obsoluted) in Windows.
I analyzed the reason, and I found the build command was unintentionally modified in the build method.
The input build command was
gcc -shared $(if $(filter-out -g -g0,-ggdb3),,-s) -x c++ -DHAVE_ISFINITE $(DEFFILE) -O3 ...
,and the desireable output should be
gcc -shared -x c++ -DHAVE_ISFINITE -O3 ...
,however, the result was
gcc -shared -O3 ...
.This PR will fix it by updating the regular expression.