To get a specific string from a string column

First you need to get the starting position of your string by CharIndex like:
CHARINDEX('https:',FeedBody,1)

Then you need to get the ending position of your string like:
CHARINDEX('?AWS',FeedBody,1)

Now you  have to Use SUBSTRING function to find your desired string by giving the starting and ending point in it which you get from CHARINDEX. like:

select
SUBSTRING(FeedBody,CHARINDEX('https:',FeedBody,1),CHARINDEX('?AWS',FeedBody,1)-CHARINDEX('https:',FeedBody,1))
 from
 feeds

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