diff --git a/Library/Homebrew/.simplecov b/Library/Homebrew/.simplecov
index 792b6951ee..ef7d8b12be 100755
--- a/Library/Homebrew/.simplecov
+++ b/Library/Homebrew/.simplecov
@@ -72,8 +72,8 @@ SimpleCov.start do
 
   require "rbconfig"
   host_os = RbConfig::CONFIG["host_os"]
-  add_filter %r{/os/mac} unless /darwin/.match?(host_os)
-  add_filter %r{/os/linux} unless /linux/.match?(host_os)
+  add_filter %r{/os/mac} unless host_os.include?("darwin")
+  add_filter %r{/os/linux} unless host_os.include?("linux")
 
   # Add groups and the proper project name to the output.
   project_name "Homebrew"
diff --git a/Library/Homebrew/extend/os/linux/system_config.rb b/Library/Homebrew/extend/os/linux/system_config.rb
index bbc79a42fc..d17b5a7516 100644
--- a/Library/Homebrew/extend/os/linux/system_config.rb
+++ b/Library/Homebrew/extend/os/linux/system_config.rb
@@ -44,8 +44,8 @@ module SystemConfig
       return unless /-microsoft/i.match?(kernel)
 
       return "2 (Microsoft Store)" if Version.new(kernel[/Linux ([0-9.]*)-.*/, 1]) > Version.new("5.15")
-      return "2" if /-microsoft/.match?(kernel)
-      return "1" if /-Microsoft/.match?(kernel)
+      return "2" if kernel.include?("-microsoft")
+      return "1" if kernel.include?("-Microsoft")
     end
 
     def dump_verbose_config(out = $stdout)
diff --git a/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb b/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb
index 322f4de60b..021122eec8 100644
--- a/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb
+++ b/Library/Homebrew/extend/os/mac/formula_cellar_checks.rb
@@ -49,7 +49,7 @@ module FormulaCellarChecks
     python_modules = Pathname.glob lib/"python*/site-packages/**/*.so"
     framework_links = python_modules.select do |obj|
       dlls = obj.dynamically_linked_libraries
-      dlls.any? { |dll| /Python\.framework/.match dll }
+      dlls.any? { |dll| dll.include?("Python.framework") }
     end
     return if framework_links.empty?