Regular expression.

[DaSe]

Hi guys , that's not really difficuly I guess but I'm just trying to get the hang of the Perl expressions.Thanks for any reply in advance.Here the question :

Why the output is "TRUE" from this code below since each letter on the right ( [col] ) must match exactly 4 times...?Since there is only "c" and one "l" in the [cool].

if ("cool" =~ m/[col]{4}/
{ print ("True") ; }

 

[Kirsle]

It's true because [col] is a "character class"

m/[col]{4}/ means "c" OR "o" OR "l" must be there 4 times.

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perl -e '$|=$i=1;print" oo\n<|>\n_|_";x:sleep$|;print"\b",$i++%2?"/":"_";goto x;'

 

[DaSe]

Thanks Kirsle.