Re^2: Using Look-ahead and Look-behind

You're reading your input line-by-line but you're trying to match across lines. That won't work.

The following should work, reading the input all at once (see perlrun):

perl -g -i -pe ’s/(?<=look)\n(?=ahead)/-/g;’ myfile.txt
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Re^3: Using Look-ahead and Look-behind by akiemr19 (Initiate) on Nov 28, 2024 at 13:24 UTC
Thank you very, very much for setting me on the right path! While (in my environment) the -g switch isn't allowed for (what I learned to be was) slurping, instead using the -0777 switch did work nicely. I had seen this switch before, but until now wasn't aware of its usage until I dug deeper, prompted by your input. I was stuck on this for a long time - thanks again for the quick response! P.S. I just found where version 5.36 would allow the use of the -g switch, which is apparently a shortcut for using -0777.	[reply]
Re^4: Using Look-ahead and Look-behind by hippo (Archbishop) on Nov 28, 2024 at 14:06 UTC
The `-g` only came in with perl 5.36 so won't be available in many LTS platforms unless they backport it. Using `-0777` as you have mentioned is perfectly fine and, AFAIAA, will continue to be. 🦛	[reply] [d/l] [select]