Regex to get words or series of words that start with a capital letter or samm word both : 
  
 







                                                                                
  I want to get regular expressin for both small and capital


 [gstr1,GSTR1,gstr2,GSTR2,GSTR3a,GSTR3b]


    I've tried
    [gstr][1-4][a-cA-D]|gstr[1-4]

    but cant get the right solution.
