regex - Regular expression help - what's wrong? -

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I want to ask for help with my regex. I need to remove the very last part from each URL. I have marked it as 'to_extract' in the example below.

I want to know what is in the following reggeks when used with sed: 

  sed 's / ^ [ht | f] tp Sample content of file.txt *   
  
  http: // a / b / c / to_extract ftp: // a / b / c / to_extract ...   
 I'm getting the right result for FTP link but not for the HT. Thanks in advance for your explanation on this I   
 
 
 change  [ht | F]  to  (ht | f) , will result in better results.  
  [abc]  means "a letter which is  a ,  b  or  c  ".  
  [ht | F]  means "a letter which is  h ,  T ,  |  or  f ", Not exactly what you want.  
 On some versions of sed, you have to call it from the  -r  option so that extended regags can be used:  
  sed - R 's / ^ (ht | f) tp * \ /// 'file.txt   
 If you want to remove the last part of the URL and do not want anything else, then you probably want  
 < Code> Sed -rn 's / ^ (ht | f) tp * \ / /// p 'file.txt

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