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Hello Cristoforo, Within the look-ahead assertion (?=$), the metacharacter $ means: Match the end of the string (or before newline at the end of the string; or before any newline if /m is used) (from “Metacharacters” in perlre#The-Basics) Since it comes after the newline within the regex pattern — and your string contains no consecutive newlines — it can match only at the very end of the string. This explains the behaviour you’re seeing. If you remove the look-ahead:
the output is displayed line-by-line, as expected. Hope that helps,
In reply to Re: matching lines in a long string
by Athanasius
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