ruby - Regex for optional quotes, array of hashes and empty string -

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I want to write a regular expression to accept the following types of ruby ​​-

1) "Value1"

2) 'value2'

3) "" or "'

4) [{: this =>: that is, I have the following: "= & gt;: This}, {'foo' = & gt;: bar}, {: bar = & gt; 'Foo'}]

/ P> 

  regex = / (["']?) ([^' ']] [?] [^' ']] <1 /   
 With that problem, he does not accept empty stars - "" and "".  
 Can you recommend any options or improvements?   
 
 
 I do not know whether regex uses flavor Ruby, but assuming it is somewhat perl-compatible:  
  regex = / (["']) (?: \\.:. ) ?? 1 /   
 demo:  
 This expression will allow you to avoid quotation in your string  "like \" "" .  
 The trick here is to use an alternative like this. The second part of the alternative ( ) will never be able to match backslash. And the non-greedy quasifier ensures that the backrefence will match the ending quote.  
 
  Edit:  In fact, I think I can forget the fourth point in your question.  
 If you want to regex to match the values ​​of values, then you have to create something else. ..  Like Parser , like this:  
  (? Value> (? & Lt; string & Gt; (? & Lt; Bid & gt; [']] (?: \\. |) *? \ K  gt; \ s * = & gt; \ s * \ g & lt; value & gt; ; \ S *), \ s *) * \ g  | \ s *) \}) | \ [(?: (?: \ S * \ g  S *, \ s *) * \ g  | \ s *) \])   
 demo:  
 This expression actually contains strings There will also be matte arrays. Note that I did not include anything for numbers because you do not mention them.  
 If you want to match only the hash specifically, then you can change the above expression in a small amount:  
  (? & Lt; value & gt; (? & Lt; string & gt; (? & Lt; quote & gt; ["']) (?: \\. |) *? \ K & lt ; Citation & gt; |:: \ w +) | (? & Lt; hash & gt; \ {(? :(? :(? & Lt; hashitem & gt; \ s * \ g  gt; \ S * = & gt; \ s * \ g , \ s *), \ s *) * \ g  | \ s *) \}) | [[ :: (?: \ S * \ g & lt; hash & gt; \ s *, \ s *) * \ g  | \ s *) \])   
 I 'will extend it to your needs.

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