diff --git a/Library/Homebrew/cask/audit.rb b/Library/Homebrew/cask/audit.rb
index b095905211..e71c4d97a5 100644
--- a/Library/Homebrew/cask/audit.rb
+++ b/Library/Homebrew/cask/audit.rb
@@ -259,7 +259,7 @@ module Cask
       bad_url_format?(/sourceforge/,
                       [
                         %r{\Ahttps://sourceforge\.net/projects/[^/]+/files/latest/download\Z},
-                        %r{\Ahttps://downloads\.sourceforge\.net/(?!(project|sourceforge)\/)},
+                        %r{\Ahttps://downloads\.sourceforge\.net/(?!(project|sourceforge)/)},
                       ])
     end
 
diff --git a/Library/Homebrew/cask/blacklist.rb b/Library/Homebrew/cask/blacklist.rb
index c37ac82fef..810067a39e 100644
--- a/Library/Homebrew/cask/blacklist.rb
+++ b/Library/Homebrew/cask/blacklist.rb
@@ -4,7 +4,7 @@ module Cask
   module Blacklist
     def self.blacklisted_reason(name)
       case name
-      when /^adobe\-(after|illustrator|indesign|photoshop|premiere)/
+      when /^adobe-(after|illustrator|indesign|photoshop|premiere)/
         "Adobe casks were removed because they are too difficult to maintain."
       when /^audacity$/
         "Audacity was removed because it is too difficult to download programmatically."
diff --git a/Library/Homebrew/cask/cmd.rb b/Library/Homebrew/cask/cmd.rb
index ce0562d87c..139e063887 100644
--- a/Library/Homebrew/cask/cmd.rb
+++ b/Library/Homebrew/cask/cmd.rb
@@ -180,7 +180,7 @@ module Cask
     end
 
     def process_options(*args)
-      exclude_regex = /^\-\-#{Regexp.union(*Config::DEFAULT_DIRS.keys.map(&Regexp.public_method(:escape)))}=/
+      exclude_regex = /^--#{Regexp.union(*Config::DEFAULT_DIRS.keys.map(&Regexp.public_method(:escape)))}=/
 
       non_options = []
 
diff --git a/Library/Homebrew/cask/cmd/options.rb b/Library/Homebrew/cask/cmd/options.rb
index 9dca4e3d7f..c6bb427892 100644
--- a/Library/Homebrew/cask/cmd/options.rb
+++ b/Library/Homebrew/cask/cmd/options.rb
@@ -46,7 +46,7 @@ module Cask
           next if self.class.options.nil?
 
           self.class.options.each do |option_name, option_method|
-            option_type = case option_name.split(/(\ |\=)/).last
+            option_type = case option_name.split(/(\ |=)/).last
             when "PATH"
               Pathname
             when /\w+(,\w+)+/
diff --git a/Library/Homebrew/cask/config.rb b/Library/Homebrew/cask/config.rb
index a415b74d78..bd9bd71155 100644
--- a/Library/Homebrew/cask/config.rb
+++ b/Library/Homebrew/cask/config.rb
@@ -86,7 +86,7 @@ module Cask
         Shellwords.shellsplit(ENV.fetch("HOMEBREW_CASK_OPTS", ""))
                   .select { |arg| arg.include?("=") }
                   .map { |arg| arg.split("=", 2) }
-                  .map { |(flag, value)| [flag.sub(/^\-\-/, ""), value] },
+                  .map { |(flag, value)| [flag.sub(/^--/, ""), value] },
       )
     end
 
diff --git a/Library/Homebrew/cask/dsl/version.rb b/Library/Homebrew/cask/dsl/version.rb
index 477360047e..fd8328ad06 100644
--- a/Library/Homebrew/cask/dsl/version.rb
+++ b/Library/Homebrew/cask/dsl/version.rb
@@ -11,9 +11,9 @@ module Cask
 
       DIVIDER_REGEX = /(#{DIVIDERS.keys.map { |v| Regexp.quote(v) }.join('|')})/.freeze
 
-      MAJOR_MINOR_PATCH_REGEX = /^([^.,:]+)(?:\.([^.,:]+)(?:\.([^.,:]+))?)?/.freeze
+      MAJOR_MINOR_PATCH_REGEX = /^([^.,:]+)(?:.([^.,:]+)(?:.([^.,:]+))?)?/.freeze
 
-      INVALID_CHARACTERS = /[^0-9a-zA-Z\.\,\:\-\_]/.freeze
+      INVALID_CHARACTERS = /[^0-9a-zA-Z.,:\-_]/.freeze
 
       class << self
         private
@@ -75,7 +75,7 @@ module Cask
         s = downcase.delete(".").gsub(/[^a-z\d]+/, "-")
 
         return true if s.match?(/(\d+|\b)(alpha|beta|preview|rc|dev|canary|snapshot)(\d+|\b)/i)
-        return true if s.match?(/\A[a-z\d]+(\-\d+)*\-?(a|b|pre)(\d+|\b)/i)
+        return true if s.match?(/\A[a-z\d]+(-\d+)*-?(a|b|pre)(\d+|\b)/i)
 
         false
       end
diff --git a/Library/Homebrew/cleanup.rb b/Library/Homebrew/cleanup.rb
index 3003de496b..c2b53660fc 100644
--- a/Library/Homebrew/cleanup.rb
+++ b/Library/Homebrew/cleanup.rb
@@ -56,14 +56,14 @@ module CleanupRefinement
         end
       end
 
-      version ||= basename.to_s[/\A.*(?:\-\-.*?)*\-\-(.*?)#{Regexp.escape(extname)}\Z/, 1]
-      version ||= basename.to_s[/\A.*\-\-?(.*?)#{Regexp.escape(extname)}\Z/, 1]
+      version ||= basename.to_s[/\A.*(?:--.*?)*--(.*?)#{Regexp.escape(extname)}\Z/, 1]
+      version ||= basename.to_s[/\A.*--?(.*?)#{Regexp.escape(extname)}\Z/, 1]
 
       return false unless version
 
       version = Version.new(version)
 
-      return false unless formula_name = basename.to_s[/\A(.*?)(?:\-\-.*?)*\-\-?(?:#{Regexp.escape(version)})/, 1]
+      return false unless formula_name = basename.to_s[/\A(.*?)(?:--.*?)*--?(?:#{Regexp.escape(version)})/, 1]
 
       formula = begin
         Formulary.from_rack(HOMEBREW_CELLAR/formula_name)
@@ -71,7 +71,7 @@ module CleanupRefinement
         return false
       end
 
-      resource_name = basename.to_s[/\A.*?\-\-(.*?)\-\-?(?:#{Regexp.escape(version)})/, 1]
+      resource_name = basename.to_s[/\A.*?--(.*?)--?(?:#{Regexp.escape(version)})/, 1]
 
       if resource_name == "patch"
         patch_hashes = formula.stable&.patches&.select(&:external?)&.map(&:resource)&.map(&:version)
@@ -92,7 +92,7 @@ module CleanupRefinement
     end
 
     def stale_cask?(scrub)
-      return false unless name = basename.to_s[/\A(.*?)\-\-/, 1]
+      return false unless name = basename.to_s[/\A(.*?)--/, 1]
 
       cask = begin
         Cask::CaskLoader.load(name)
@@ -100,7 +100,7 @@ module CleanupRefinement
         return false
       end
 
-      return true unless basename.to_s.match?(/\A#{Regexp.escape(name)}\-\-#{Regexp.escape(cask.version)}\b/)
+      return true unless basename.to_s.match?(/\A#{Regexp.escape(name)}--#{Regexp.escape(cask.version)}\b/)
 
       return true if scrub && !cask.versions.include?(cask.version)
 
diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index a35795044e..b9108f3e08 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -669,7 +669,7 @@ module Homebrew
                                                        .map(&:to_i)
 
       case (url = stable.url)
-      when /[\d\._-](alpha|beta|rc\d)/
+      when /[\d._-](alpha|beta|rc\d)/
         matched = Regexp.last_match(1)
         version_prefix = stable_version_string.sub(/\d+$/, "")
         return if UNSTABLE_WHITELIST[formula.name] == version_prefix
@@ -803,7 +803,7 @@ module Homebrew
       end
       bin_names.each do |name|
         ["system", "shell_output", "pipe_output"].each do |cmd|
-          if text.to_s.match?(/test do.*#{cmd}[\(\s]+['"]#{Regexp.escape(name)}[\s'"]/m)
+          if text.to_s.match?(/test do.*#{cmd}[(\s]+['"]#{Regexp.escape(name)}[\s'"]/m)
             problem %Q(fully scope test #{cmd} calls, e.g. #{cmd} "\#{bin}/#{name}")
           end
         end
diff --git a/Library/Homebrew/dev-cmd/bottle.rb b/Library/Homebrew/dev-cmd/bottle.rb
index a296594097..20fc41ed2a 100644
--- a/Library/Homebrew/dev-cmd/bottle.rb
+++ b/Library/Homebrew/dev-cmd/bottle.rb
@@ -321,7 +321,7 @@ module Homebrew
         if any_go_deps
           go_regex =
             Version.formula_optionally_versioned_regex(:go, full: false)
-          ignores << %r{#{Regexp.escape(HOMEBREW_CELLAR)}/#{go_regex}/[\d\.]+/libexec}
+          ignores << %r{#{Regexp.escape(HOMEBREW_CELLAR)}/#{go_regex}/[\d.]+/libexec}
         end
 
         relocatable = true
diff --git a/Library/Homebrew/dev-cmd/bump-formula-pr.rb b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
index 77b64f8832..c3426f0ae3 100644
--- a/Library/Homebrew/dev-cmd/bump-formula-pr.rb
+++ b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
@@ -79,7 +79,7 @@ module Homebrew
       origin_branch = "#{homebrew_core_remote}/#{homebrew_core_branch}"
       previous_branch = Utils.popen_read("git -C \"#{formula.tap.path}\" symbolic-ref -q --short HEAD").chomp
       previous_branch = "master" if previous_branch.empty?
-      formula_path = formula.path.to_s[%r{(Formula\/.*)}, 1]
+      formula_path = formula.path.to_s[%r{(Formula/.*)}, 1]
 
       if args.dry_run?
         ohai "git remote add #{homebrew_core_remote} #{homebrew_core_url}"
@@ -89,7 +89,7 @@ module Homebrew
         return tap_full_name, origin_branch, previous_branch
       else
         formula.path.parent.cd do
-          unless Utils.popen_read("git remote -v").match?(%r{^homebrew.*Homebrew\/homebrew-core.*$})
+          unless Utils.popen_read("git remote -v").match?(%r{^homebrew.*Homebrew/homebrew-core.*$})
             ohai "Adding #{homebrew_core_remote} remote"
             safe_system "git", "remote", "add", homebrew_core_remote, homebrew_core_url
           end
@@ -225,7 +225,7 @@ module Homebrew
 
     replacement_pairs += formula_spec.mirrors.map do |mirror|
       [
-        / +mirror \"#{Regexp.escape(mirror)}\"\n/m,
+        / +mirror "#{Regexp.escape(mirror)}"\n/m,
         "",
       ]
     end
@@ -258,7 +258,7 @@ module Homebrew
 
     if new_mirrors
       replacement_pairs << [
-        /^( +)(url \"#{Regexp.escape(new_url)}\"\n)/m,
+        /^( +)(url "#{Regexp.escape(new_url)}"\n)/m,
         "\\1\\2\\1mirror \"#{new_mirrors.join("\"\n\\1mirror \"")}\"\n",
       ]
     end
@@ -283,30 +283,30 @@ module Homebrew
           ]
         elsif new_mirrors
           [
-            /^( +)(mirror \"#{Regexp.escape(new_mirrors.last)}\"\n)/m,
+            /^( +)(mirror "#{Regexp.escape(new_mirrors.last)}"\n)/m,
             "\\1\\2\\1version \"#{forced_version}\"\n",
           ]
         else
           [
-            /^( +)(url \"#{Regexp.escape(new_url)}\"\n)/m,
+            /^( +)(url "#{Regexp.escape(new_url)}"\n)/m,
             "\\1\\2\\1version \"#{forced_version}\"\n",
           ]
         end
       elsif requested_spec == :devel
         replacement_pairs << [
-          /(  devel do.+?version \")#{old_formula_version}(\"\n.+?end\n)/m,
+          /(  devel do.+?version ")#{old_formula_version}("\n.+?end\n)/m,
           "\\1#{forced_version}\\2",
         ]
       end
     elsif forced_version && forced_version == "0"
       if requested_spec == :stable
         replacement_pairs << [
-          /^  version \"[\w\.\-\+]+\"\n/m,
+          /^  version "[\w.\-+]+"\n/m,
           "",
         ]
       elsif requested_spec == :devel
         replacement_pairs << [
-          /(  devel do.+?)^ +version \"[^\n]+\"\n(.+?end\n)/m,
+          /(  devel do.+?)^ +version "[^\n]+"\n(.+?end\n)/m,
           "\\1\\2",
         ]
       end
diff --git a/Library/Homebrew/dev-cmd/pull.rb b/Library/Homebrew/dev-cmd/pull.rb
index 5950f72bea..d15312a901 100644
--- a/Library/Homebrew/dev-cmd/pull.rb
+++ b/Library/Homebrew/dev-cmd/pull.rb
@@ -333,7 +333,7 @@ module Homebrew
 
   def check_bintray_mirror(name, url)
     headers, = curl_output("--connect-timeout", "15", "--location", "--head", url)
-    status_code = headers.scan(%r{^HTTP\/.* (\d+)}).last.first
+    status_code = headers.scan(%r{^HTTP/.* (\d+)}).last.first
     return if status_code.start_with?("2")
 
     opoo "The Bintray mirror #{url} is not reachable (HTTP status code #{status_code})."
diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 3d8ca97571..e98b300828 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -221,7 +221,7 @@ class AbstractFileDownloadStrategy < AbstractDownloadStrategy
   end
 
   def basename
-    cached_location.basename.sub(/^[\da-f]{64}\-\-/, "")
+    cached_location.basename.sub(/^[\da-f]{64}--/, "")
   end
 
   private
@@ -390,7 +390,7 @@ class CurlDownloadStrategy < AbstractFileDownloadStrategy
     filenames = lines.map(&parse_content_disposition).compact
 
     time =
-      lines.map { |line| line[/^Last\-Modified:\s*(.+)/i, 1] }
+      lines.map { |line| line[/^Last-Modified:\s*(.+)/i, 1] }
            .compact
            .map { |t| t.match?(/^\d+$/) ? Time.at(t.to_i) : Time.parse(t) }
            .last
@@ -820,7 +820,7 @@ class GitHubGitDownloadStrategy < GitDownloadStrategy
 
     return unless status.success?
 
-    commit = output[/^ETag: \"(\h+)\"/, 1]
+    commit = output[/^ETag: "(\h+)"/, 1]
     version.update_commit(commit) if commit
     commit
   end
diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 2837ff096e..e0c331f4dd 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -224,7 +224,7 @@ class Pathname
     return archive_ext if archive_ext
 
     # Don't treat version numbers as extname.
-    return "" if basename.match?(/\b\d+\.\d+[^\.]*\Z/) && !basename.end_with?(".7z")
+    return "" if basename.match?(/\b\d+\.\d+[^.]*\Z/) && !basename.end_with?(".7z")
 
     File.extname(basename)
   end
diff --git a/Library/Homebrew/extend/string.rb b/Library/Homebrew/extend/string.rb
index 8219024021..903168af60 100644
--- a/Library/Homebrew/extend/string.rb
+++ b/Library/Homebrew/extend/string.rb
@@ -26,7 +26,7 @@ module StringInreplaceExtension
   # Looks for Makefile style variable definitions and replaces the
   # value with "new_value", or removes the definition entirely.
   def change_make_var!(flag, new_value)
-    return if gsub!(/^#{Regexp.escape(flag)}[ \t]*[\\?\+\:\!]?=[ \t]*((?:.*\\\n)*.*)$/, "#{flag}=#{new_value}", false)
+    return if gsub!(/^#{Regexp.escape(flag)}[ \t]*[\\?+:!]?=[ \t]*((?:.*\\\n)*.*)$/, "#{flag}=#{new_value}", false)
 
     errors << "expected to change #{flag.inspect} to #{new_value.inspect}"
   end
@@ -35,7 +35,7 @@ module StringInreplaceExtension
   def remove_make_var!(flags)
     Array(flags).each do |flag|
       # Also remove trailing \n, if present.
-      unless gsub!(/^#{Regexp.escape(flag)}[ \t]*[\\?\+\:\!]?=(?:.*\\\n)*.*$\n?/, "", false)
+      unless gsub!(/^#{Regexp.escape(flag)}[ \t]*[\\?+:!]?=(?:.*\\\n)*.*$\n?/, "", false)
         errors << "expected to remove #{flag.inspect}"
       end
     end
@@ -43,6 +43,6 @@ module StringInreplaceExtension
 
   # Finds the specified variable
   def get_make_var(flag)
-    self[/^#{Regexp.escape(flag)}[ \t]*[\\?\+\:\!]?=[ \t]*((?:.*\\\n)*.*)$/, 1]
+    self[/^#{Regexp.escape(flag)}[ \t]*[\\?+:!]?=[ \t]*((?:.*\\\n)*.*)$/, 1]
   end
 end
diff --git a/Library/Homebrew/locale.rb b/Library/Homebrew/locale.rb
index c005e5296d..174c594ad9 100644
--- a/Library/Homebrew/locale.rb
+++ b/Library/Homebrew/locale.rb
@@ -8,7 +8,7 @@ class Locale
   REGION_REGEX   = /(?:[A-Z]{2}|\d{3})/.freeze # ISO 3166-1 or UN M.49
   SCRIPT_REGEX   = /(?:[A-Z][a-z]{3})/.freeze  # ISO 15924
 
-  LOCALE_REGEX = /\A((?:#{LANGUAGE_REGEX}|#{REGION_REGEX}|#{SCRIPT_REGEX})(?:\-|$)){1,3}\Z/.freeze
+  LOCALE_REGEX = /\A((?:#{LANGUAGE_REGEX}|#{REGION_REGEX}|#{SCRIPT_REGEX})(?:-|$)){1,3}\Z/.freeze
 
   def self.parse(string)
     string = string.to_s
@@ -16,7 +16,7 @@ class Locale
     raise ParserError, "'#{string}' cannot be parsed to a #{self}" unless string.match?(LOCALE_REGEX)
 
     scan = proc do |regex|
-      string.scan(/(?:\-|^)(#{regex})(?:\-|$)/).flatten.first
+      string.scan(/(?:-|^)(#{regex})(?:-|$)/).flatten.first
     end
 
     language = scan.call(LANGUAGE_REGEX)
diff --git a/Library/Homebrew/rubocops/cask/homepage_matches_url.rb b/Library/Homebrew/rubocops/cask/homepage_matches_url.rb
index b260d5c730..d142ad7170 100644
--- a/Library/Homebrew/rubocops/cask/homepage_matches_url.rb
+++ b/Library/Homebrew/rubocops/cask/homepage_matches_url.rb
@@ -129,7 +129,7 @@ module RuboCop
           string = stanza.stanza_node.children[2]
           return string.str_content if string.str_type?
 
-          string.to_s.gsub(%r{.*"([a-z0-9]+\:\/\/[^"]+)".*}m, '\1')
+          string.to_s.gsub(%r{.*"([a-z0-9]+://[^"]+)".*}m, '\1')
         end
 
         def url_match_homepage?(stanza)
diff --git a/Library/Homebrew/rubocops/lines.rb b/Library/Homebrew/rubocops/lines.rb
index 5ed08a2e03..7de4690695 100644
--- a/Library/Homebrew/rubocops/lines.rb
+++ b/Library/Homebrew/rubocops/lines.rb
@@ -153,7 +153,7 @@ module RuboCop
 
           find_instance_method_call(body_node, :build, :include?) do |method|
             arg = parameters(method).first
-            next unless match = regex_match_group(arg, /^\-\-(.*)$/)
+            next unless match = regex_match_group(arg, /^--(.*)$/)
 
             problem "Reference '#{match[1]}' without dashes"
           end
@@ -403,7 +403,7 @@ module RuboCop
 
             path = parameters(method).first
             next unless path.str_type?
-            next unless match = regex_match_group(path, /^[^\*{},]+$/)
+            next unless match = regex_match_group(path, /^[^*{},]+$/)
 
             problem "Dir([\"#{string_content(path)}\"]) is unnecessary; just use \"#{match[0]}\""
           end
diff --git a/Library/Homebrew/system_config.rb b/Library/Homebrew/system_config.rb
index def1702154..75fff1db24 100644
--- a/Library/Homebrew/system_config.rb
+++ b/Library/Homebrew/system_config.rb
@@ -88,7 +88,7 @@ class SystemConfig
       _, err, status = system_command("java", args: ["-version"], print_stderr: false)
       return "N/A" unless status.success?
 
-      err[/java version "([\d\._]+)"/, 1] || "N/A"
+      err[/java version "([\d._]+)"/, 1] || "N/A"
     end
 
     def describe_git
@@ -100,7 +100,7 @@ class SystemConfig
     def describe_curl
       out, = system_command(curl_executable, args: ["--version"])
 
-      if /^curl (?<curl_version>[\d\.]+)/ =~ out
+      if /^curl (?<curl_version>[\d.]+)/ =~ out
         "#{curl_version} => #{curl_executable}"
       else
         "N/A"
diff --git a/Library/Homebrew/test/cmd/--cache_spec.rb b/Library/Homebrew/test/cmd/--cache_spec.rb
index d682565306..42b452ec60 100644
--- a/Library/Homebrew/test/cmd/--cache_spec.rb
+++ b/Library/Homebrew/test/cmd/--cache_spec.rb
@@ -9,7 +9,7 @@ end
 describe "brew --cache", :integration_test do
   it "prints all cache files for a given Formula" do
     expect { brew "--cache", testball }
-      .to output(%r{#{HOMEBREW_CACHE}/downloads/[\da-f]{64}\-\-testball\-}).to_stdout
+      .to output(%r{#{HOMEBREW_CACHE}/downloads/[\da-f]{64}--testball-}).to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
   end
diff --git a/Library/Homebrew/test/cmd/install_spec.rb b/Library/Homebrew/test/cmd/install_spec.rb
index b0623567a3..70ba941c78 100644
--- a/Library/Homebrew/test/cmd/install_spec.rb
+++ b/Library/Homebrew/test/cmd/install_spec.rb
@@ -68,7 +68,7 @@ describe "brew install", :integration_test do
     # and there will be the git requirement, but we cannot instantiate git
     # formula since we only have testball1 formula.
     expect { brew "install", "testball1", "--HEAD", "--ignore-dependencies" }
-      .to output(%r{#{HOMEBREW_CELLAR}/testball1/HEAD\-d5eb689}).to_stdout
+      .to output(%r{#{HOMEBREW_CELLAR}/testball1/HEAD-d5eb689}).to_stdout
       .and output(/Cloning into/).to_stderr
       .and be_a_success
     expect(HOMEBREW_CELLAR/"testball1/HEAD-d5eb689/foo/test").not_to be_a_file
diff --git a/Library/Homebrew/test/rubocops/homepage_spec.rb b/Library/Homebrew/test/rubocops/homepage_spec.rb
index cfeff7f5bb..033cd0a0bb 100644
--- a/Library/Homebrew/test/rubocops/homepage_spec.rb
+++ b/Library/Homebrew/test/rubocops/homepage_spec.rb
@@ -73,7 +73,7 @@ describe RuboCop::Cop::FormulaAudit::Homepage do
         RUBY
 
         inspect_source(source)
-        if homepage.match?(%r{http:\/\/www\.freedesktop\.org})
+        if homepage.match?(%r{http://www\.freedesktop\.org})
           if homepage.match?(/Software/)
             expected_offenses = [{  message:  "#{homepage} should be styled " \
                                              "`https://wiki.freedesktop.org/www/Software/project_name`",
@@ -89,7 +89,7 @@ describe RuboCop::Cop::FormulaAudit::Homepage do
                                     column:   2,
                                     source:   source }]
           end
-        elsif homepage.match?(%r{https:\/\/code\.google\.com})
+        elsif homepage.match?(%r{https://code\.google\.com})
           expected_offenses = [{  message:  "#{homepage} should end with a slash",
                                   severity: :convention,
                                   line:     2,
diff --git a/Library/Homebrew/test/searchable_spec.rb b/Library/Homebrew/test/searchable_spec.rb
index aaf88c2eaf..6fdb4557d7 100644
--- a/Library/Homebrew/test/searchable_spec.rb
+++ b/Library/Homebrew/test/searchable_spec.rb
@@ -19,7 +19,7 @@ describe Searchable do
 
     context "when given a regex" do
       it "does not simplify strings" do
-        expect(subject.search(/with\-dashes/)).to eq ["with-dashes"]
+        expect(subject.search(/with-dashes/)).to eq ["with-dashes"]
       end
     end
 
diff --git a/Library/Homebrew/test/utils_spec.rb b/Library/Homebrew/test/utils_spec.rb
index d27290ef47..977852b6b2 100644
--- a/Library/Homebrew/test/utils_spec.rb
+++ b/Library/Homebrew/test/utils_spec.rb
@@ -253,7 +253,7 @@ describe "globally-scoped helper methods" do
         )
       }.to raise_error(
         MethodDeprecatedError,
-        %r{method.*replacement.*homebrew/core.*\/Taps\/homebrew\/homebrew-core\/}m,
+        %r{method.*replacement.*homebrew/core.*/Taps/homebrew/homebrew-core/}m,
       )
     end
   end
diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 4f099ceada..3ddf50c79c 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -168,7 +168,7 @@ module Kernel
       tap = Tap.fetch(match[:user], match[:repo])
       tap_message = +"\nPlease report this issue to the #{tap} tap (not Homebrew/brew or Homebrew/core)"
       tap_message += ", or even better, submit a PR to fix it" if replacement
-      tap_message << ":\n  #{line.sub(/^(.*\:\d+)\:.*$/, '\1')}\n\n"
+      tap_message << ":\n  #{line.sub(/^(.*:\d+):.*$/, '\1')}\n\n"
       break
     end
 
diff --git a/Library/Homebrew/utils/curl.rb b/Library/Homebrew/utils/curl.rb
index 25d5e2235b..7503e16822 100644
--- a/Library/Homebrew/utils/curl.rb
+++ b/Library/Homebrew/utils/curl.rb
@@ -196,7 +196,7 @@ def curl_http_content_headers_and_checksum(url, hash_needed: false, user_agent:
   status_code = :unknown
   while status_code == :unknown || status_code.to_s.start_with?("3")
     headers, _, output = output.partition("\r\n\r\n")
-    status_code = headers[%r{HTTP\/.* (\d+)}, 1]
+    status_code = headers[%r{HTTP/.* (\d+)}, 1]
     final_url = headers[/^Location:\s*(.*)$/i, 1]&.chomp
   end
 
@@ -208,7 +208,7 @@ def curl_http_content_headers_and_checksum(url, hash_needed: false, user_agent:
     url:            url,
     final_url:      final_url,
     status:         status_code,
-    etag:           headers[%r{ETag: ([wW]\/)?"(([^"]|\\")*)"}, 2],
+    etag:           headers[%r{ETag: ([wW]/)?"(([^"]|\\")*)"}, 2],
     content_length: headers[/Content-Length: (\d+)/, 1],
     file_hash:      output_hash,
     file:           output,