regex - RegExp for dates Extjs 3.4 -

I have trouble creating regExp for search panel

  & amp; Amp; (Item.Get ('prompt')> date = dateStartValue.format ("Y-M-D") & amp; Amp; (Item.get ('prodAddDate') & lt; = dateEndValue.format ("Y-M-D"));   
 I'm not sure that this is work for refExp, but I do not have any other ideas  
 The problem is that when I can not fill the field with the date I can not filter data with other conditions  
 I was trying something like this but not working  
  & amp; ((Item.get ('prodAddDate') & gt; dateStartValue.format ("Y-M-D")) (New RegExp (dateStartValue). Exam (item.get ('prodAddDate')) & Amp; Amp; ((Item.get ('prodAddDate') & lt; = dateEndValue.format ("Y-M-D")) || (New RegExp). Test (item.get ('prodAddDate'));    
 
 
 Not entirely sure what you are trying to do, but Here are some pieces of information that I hope can help you solve your problem.  
 Priority of comparison operators  
  and  operator priority  || , which means that:  
  A || B & amp; C || D is equivalent to   
:  
  A || (B & amp; c) || D   
 No:  
  (A || B) & amp; Amp; (C) || Date comparison  
 You can compare objects directly to  date : Code> // example data var d1 = new date ('2012-12-12'), D2 = new date ('2012-12-12'), d3 = new date ('2013-01-01') ;   
 and you  & lt; ,  & gt; ,  & lt; = , and  & gt; = :  
  // logical results D1 & lt; D3 / True D1 & Lt; D2 / False D2 & gt; D3 / false D1 and LT; = D2 / true D1 = & gt; D2 // true   
 but not comparing equality with  == :  
  d1 == d2 // still Wrong // ... D1 and LT; = D2 & amp; D1 = & gt; D2 // True   
 Conclusion: To test that a date before or after a date, direct comparison is OK. But, if the two dates are the same, then compare the string to test it:  
  // Is that the same day? D1.format ('y-m-d') === d2.format ('y-m-d') // True // Is this the same day and hour? D1.format ('Ymd H: i: s') === d2.format ('Ymd H: i: s') // true   
 Ext.isEmpty ()  null ,  undefined  and empty string  ''   only   
  Ext.isEmpty (Empty) // True Ext.isEmpty (Undefined) // True Ext.isEmpty ('') // True Ext.isEmpty ('') / / False Ext.isEmpty (false) // false // etc.   
 This can be useful for addressing your blank field case:  
  ... & amp; & Amp; (Ext. Istity (Ietate.Gate ('ProdaidDate'). Item () ('Promoded') & gt; = DataStart Value) & amp; Ent.ISTT (iTet.Jet (ProdaidDate) || 'ProdAddDate') & lt; = dateEndValue)   
 Finally  
 about regex What is this obsession? They are useful for testing / removing complex strings, but this is all you should forget about them for a little while, dude, p