various: proper escape in regex

Library/Homebrew/cmd/audit.rb

@@ -142,7 +142,7 @@ class FormulaAuditor
     swig
   ]
 
-  FILEUTILS_METHODS = FileUtils.singleton_methods(false).join "|"
+  FILEUTILS_METHODS = FileUtils.singleton_methods(false).map { |m| Regexp.escape(m) }.join "|"
 
   def initialize(formula, options = {})
     @formula = formula

Library/Homebrew/cmd/bottle.rb

@@ -238,7 +238,7 @@ module Homebrew
 
         ignores = []
         if f.deps.any? { |dep| dep.name == "go" }
-          ignores << %r{#{HOMEBREW_CELLAR}/go/[\d\.]+/libexec}
+          ignores << %r{#{Regexp.escape(HOMEBREW_CELLAR)}/go/[\d\.]+/libexec}
         end
 
         if ARGV.include? "--skip-relocation"

Library/Homebrew/cmd/create.rb

@@ -110,7 +110,7 @@ class FormulaCreator
       when %r{github\.com/\S+/(\S+)/archive/}
         @name = $1
       else
-        /(.*?)[-_.]?#{path.version}/.match path.basename
+        /(.*?)[-_.]?#{Regexp.escape(path.version)}/.match path.basename
         @name = $1
       end
     end