Always use the \s. That white space could be a tab for all we know.
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Hi mon3am, I would say yes, but your guess is as good as mine. The CLAD2017 Preparation Guide has a question that uses Match Pattern (Page 26 Question 9). Match Pattern and Match Regular Expression are also useful when building questions around Loops, Shift Registers etc. so you might see them used because of that. I guess the difficult bit is how much of the Regular Expression syntax you will need to remember. The guide gives us a hint here also and leads me to think that simple syntax (a comma, see page 26 question 9) might be tested.