python - Delete lines from text file using regex sub -


I have a text file that has lines like this: 

  fruit = apple id = = 1001 = weight = 7 colors = red ... fruit = watermelon id = # 1002 weight = 20 color = green ... fruit = cherry id = # 1003 ...   
 I Trying to remove all the rows related to the fruit to remove an id of the fruit. So, I read in  # 1002  and I want to delete all the lines from  fruit = melon  (but not included in this)  fruit = cherry  . I do not know how much information each fruit has and they will be different.  
 I have tried to use regex via the following logic:  
  repl_string = "fruit = (. *?) \ NId =" + user_inputted_id_to_match + " \ N (*. * Basically, I'm matching the line with the  function , which is   
  id  line that user Gives me everything and then brings everything to a lookhead for the next  fruit  line, does this make sense?  
 I ran and only in the resulting text file The value of  Id  was deleted Is:  
  fruit = Apple id = # 1001 weight = 7 colors = red ... fruit = watermelon id = weight = 20 color = green ... fruit = cherry id = # 1003. ..   
 How do I delete? All the lines corresponding to a given result?

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