objective c - Extract the text between the two substring in NSString -

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I need to remove all the lines between the two stars, such as start and end in nsstring

For example, 

  & lt; Some text & gt; Start Line 1 Line 2 & lt; Some text & gt; Start Line 1 Line 2 Completion   
 I need to discard all the lessons that are not coming under these blocks. Any idea how to do it   
 
 
 see  -componentsSeparatedByString:  in  NSSTING DOCUMENTATION.

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