regex - negative lookbefore for a blackslash in ruby 1.9 -

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I want to match every '[' or ']' which is not in ruby ​​before backslash 1.9 I try Key: 

  /? & Lt ;! \ 134 [\ [\]] /

and 

  /? & Lt ;!  
 
 
   Post -text "itemprop =" text "> 
 Take a negative look in the brackets.  
  (? & Lt;! \\) [\ [\]]

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