haskell - How to get output of function returning Maybe? -

This is a newbie question.

I am having trouble understanding the output of the StripProfix function which might be [ A] gives.

What I am doing, I am passing two strings for strip syntax so that it returns back

In the first case, my print operation ( putStrLn b ) with error "" [four] '' with [code] perhaps [character] / P>

^{From the comment on the question:}

In GHCI, if you can a to probably a you have some options first, if you are sure that this is a Sessions will succeed with some , you can

  & gt; Just a = just 1> Print 1   
 However, this may be due to your problems if your operation is not successful  
  & gt; Let's just do a = nothing: maybe int> Print a *** Exception & lt; Interactive & gt; 12: 5-20: Incompatible patterns for patterns fail. Maybe. Just a   
 All this is saying that the patterns used by you have failed. How do we avoid this? The statements of the case are:  
  & gt; - Enable multiline input (I have this .ghci file, so it always keeps on) & gt; : Set + M & gt; Maybe A = just 1. & Gt; Maybe the case Just x - & gt; Print x | Nothing - & gt; Return () - Nothing. 1   
 But it is laborious. Would not it be nice if any alternative was made in Haskele? Fortunately, there are  data in it. Maybe  Module:  
  & gt; Import data. Probably & gt; : Probably may be: B -> (A -> B) - & gt; Maybe A -> B & gt; - In the case of zero -1, our default value of -1 is; Print $ probably (-1) ID $ bus 1 1 & gt; Printed $ probably (-1) id $ no something -1   
 It can also be an easy task to use whenever you want, either  just < / Code> or a default value:  
  & gt; Perhaps $ 1 from print $ is rarely 1 1   
 but  probably  is more powerful in general:  
 > ; Print $ probably 0 (\ x - & gt; 2 * x - x * x * x + 7 ^ x) $ bus 3 322   
 Yet many times, however, whatever you Want to know if any operation was successful. For this,  data may be  in  unmaxed  and  is not :  
  & gt; Only $ 1 True & gt; Only $ some is not wrong   
 and  is not = not just required , obviously.