Fix JavaScript Regex Pattern

.rubocop.yml

@@ -2,6 +2,7 @@ inherit_from: .rubocop_todo.yml
 
 AllCops:
   TargetRubyVersion: 2.3
+  DisplayStyleGuide: true
   Exclude:
     - 'test/scanners/**/*'
     - 'bench/example.ruby'

.rubocop_todo.yml

@@ -237,18 +237,7 @@ Layout/SpaceAfterComma:
 # Cop supports --auto-correct.
 # Configuration parameters: AllowForAlignment.
 Layout/SpaceAroundOperators:
-  Exclude:
-    - 'ideosyncratic-ruby.rb'
-    - 'lib/coderay/scanners/c.rb'
-    - 'lib/coderay/scanners/cpp.rb'
-    - 'lib/coderay/scanners/diff.rb'
-    - 'lib/coderay/scanners/groovy.rb'
-    - 'lib/coderay/scanners/java.rb'
-    - 'lib/coderay/scanners/java_script.rb'
-    - 'lib/coderay/scanners/python.rb'
-    - 'lib/coderay/scanners/ruby/patterns.rb'
-    - 'rake_tasks/code_statistics.rb'
-    - 'test/unit/json_encoder.rb'
+  AllowForAlignment: true
 
 # Offense count: 2
 # Cop supports --auto-correct.
@@ -541,29 +530,6 @@ Naming/VariableNumber:
   Exclude:
     - 'test/unit/tokens.rb'
 
-# Offense count: 1
-Performance/Caller:
-  Exclude:
-    - 'lib/coderay/scanners/scanner.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Performance/Casecmp:
-  Exclude:
-    - 'rake_tasks/generator.rake'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Performance/StringReplacement:
-  Exclude:
-    - 'lib/coderay/encoders/html.rb'
-
-# Offense count: 3
-Performance/UnfreezeString:
-  Exclude:
-    - 'lib/coderay/encoders/encoder.rb'
-    - 'lib/coderay/encoders/html.rb'
-
 # Offense count: 1
 # Cop supports --auto-correct.
 # Configuration parameters: AutoCorrect.

lib/coderay/scanners/java_script.rb

@@ -40,13 +40,13 @@ class JavaScript < Scanner
       add(KEYWORDS, :keyword)  # :nodoc:
 
     ESCAPE = / [bfnrtv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x  # :nodoc:
-    UNICODE_ESCAPE =  / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x  # :nodoc:
-    REGEXP_ESCAPE =  / [bBdDsSwW] /x  # :nodoc:
-    STRING_CONTENT_PATTERN = {
+    UNICODE_ESCAPE = / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x  # :nodoc:
+    REGEXP_ESCAPE = / [bBdDsSwW] /x  # :nodoc:
+    STRING_CONTENT_PATTERN  = {
       "'" => /[^\\']+/,
       '"' => /[^\\"]+/,
-      '/' => /[^\\\/]+/,
-    }  # :nodoc:
+      '/' => %r{ (?: [^\\/\[]+ | \[ ([^\]\\]+ | \\.)* \]? )+ }mx,
+    }.freeze  # :nodoc:
     KEY_CHECK_PATTERN = {
       "'" => / (?> [^\\']* (?: \\. [^\\']* )* ) ' \s* : /mx,
       '"' => / (?> [^\\"]* (?: \\. [^\\"]* )* ) " \s* : /mx,
@@ -219,8 +219,6 @@ def scan_tokens encoder, options
       encoder
     end
 
-  protected
-
     def reset_instance
       super
       @xml_scanner.reset if defined? @xml_scanner