allowing inner slashes in regexes

examples/code.cs

@@ -21,6 +21,8 @@ spaced_out_multiline_object: {
 
   list: [1, 2, 3, 4]
 
+  regex: /match[ing](every|thing|\/)/gi
+
   three: new Idea()
 
   inner_obj: {

lib/coffee_script/lexer.rb

@@ -18,7 +18,7 @@ class Lexer
   NEWLINE    = /\A([\r\n]+)/
   COMMENT    = /\A(#[^\r\n]*)/
   CODE       = /\A(=>)/
-  REGEX      = /\A(\/(.*?)\/[imgy]{0,4})/
+  REGEX      = /\A(\/(.*?)[^\\]\/[imgy]{0,4})/
 
   JS_CLEANER = /(\A`|`\Z)/
   MULTILINER = /[\r\n]/