Re^3: A regex that only matches at offset that are multiples of a given N?


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Re^3: A regex that only matches at offset that are multiples of a given N?

by choroba (Cardinal)

on Feb 13, 2013 at 16:31 UTC ( [id://1018570]=note: print w/replies, xml )

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in reply to Re^2: A regex that only matches at offset that are multiples of a given N?
in thread A regex that only matches at offset that are multiples of a given N?

Why have you removed the ^ anchor?

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Re^4: A regex that only matches at offset that are multiples of a given N?
by BrowserUk (Patriarch) on Feb 13, 2013 at 16:36 UTC

Because with it, it only matches the first match; not any second or subsequent properly aligned matches?:

print "$-[0]: $1" while $a =~ m[(?:.{4})*(?=(aa..))]g;;
0: aawx
404: aawx
405: aadz
481: aadz

print "$-[0]: $1" while $a =~ m[^(?:.{4})*(?=(aa..))]g;;
0: aawx

print "$-[0]: $1" while $a =~ m[(?:.{4})*(?=(gg..))]g;;
0: gghn
208: gghn
211: ggyj
955: ggyj

print "$-[0]: $1" while $a =~ m[^(?:.{4})*(?=(gg..))]g;;
0: gghn
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