Rails 3 routing constraints don't seem to be matching the regex properly -


I am using Rail 3.0.5 and I have setup a route using a regedx constraint. This train used to work on 2.3.5, but it is not working in Rail 3. The route looks like this: 

  get '/: version_id' = & gt; 'Paste #Shows',: Barriers = & gt; {: Version_id = & gt; / [\ D \ w] {40} /}   
 This does not work at all, however, the following tasks:  
  get '/: version_id '= & Gt; 'Paste #Shows',: Barriers = & gt; {: Version_id = & gt; /.{40}/} '/: version_id' = & gt; 'Paste #Shows',: Barriers = & gt; {: Version_id = & gt; / \ W {40} Get the '/: version_id' = & gt; 'Paste # show'   
 Is there something wrong with the management of the railroad []? Or am I doing something wrong?  
 Version_ID usually looks something like this:  
  816616001d7ce848944a9e0d71a5a22d3b546943    
 
 
 I do not have any solution, why not work on another.  
 However, according to the PickX Book,  \ W  is actually a superset of  \ d .  
  \ w [a-za-z0-9 \ _] character of ASCII word \ d [0- 9] character of ASCII decimal digits   
 Therefore,  [\ d \ w] {40}  is no different from  \ w {40} , which works for you.

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