Re^3: Regular Expression - delimiter/spaces problem


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Re^3: Regular Expression - delimiter/spaces problem

by shmem (Chancellor)

on Feb 15, 2014 at 14:59 UTC ( [id://1075050]=note: print w/replies, xml )

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in reply to Re^2: Regular Expression - delimiter/spaces problem
in thread Regular Expression - delimiter/spaces problem

Why are using (?:)?

The "?:" reduces the parens effect to grouping. That means, the content of the parens will not be captured to populate a $< digit> variable ($1, $2, $3, ...). It is good practice to state exactly what is meant; and if you want to just group alternatives, then (?:) is the fitting expression.

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'