diff --git a/Formula/brewsci-superlu-dist.rb b/Formula/brewsci-superlu-dist.rb
index 2aea525..52ed093 100644
--- a/Formula/brewsci-superlu-dist.rb
+++ b/Formula/brewsci-superlu-dist.rb
@@ -69,7 +69,7 @@ def install
     return if OS.linux? && ENV["GITHUB_ACTIONS"]
 
     output = shell_output("mpirun -np 4 ./pddrive -r 2 -c 2 g20.rua")
-    accuracy = ((output.lines.grep /Sol  0/)[-1]).to_f
+    accuracy = ((output.lines.grep(/Sol  0/))[-1]).to_f
     assert accuracy < 1.0e-8
   end
 end
diff --git a/Formula/tetgen.rb b/Formula/tetgen.rb
index 4652e4b..5e027d2 100644
--- a/Formula/tetgen.rb
+++ b/Formula/tetgen.rb
@@ -34,9 +34,9 @@ def install
   test do
     cp pkgshare/"example.poly", testpath
     output = shell_output("#{bin}/tetgen -pq1.2V example.poly")
-    assert_match /[Ss]tatistics/, output, "Missing statistics in output"
-    assert_match /[Hh]istogram/, output, "Missing histogram in output"
-    assert_match /seconds/, output, "Missing timings in output"
+    assert_match(/[Ss]tatistics/, output, "Missing statistics in output")
+    assert_match(/[Hh]istogram/, output, "Missing histogram in output")
+    assert_match(/seconds/, output, "Missing timings in output")
     outfile_suffixes = %w[node ele face edge]
     outfile_suffixes.each do |suff|
       assert_predicate testpath/"example.1.#{suff}", :exist?