Re^3: \s does not match end-of-line

As Athanasius's examples here demonstrate, the \s class requires a whitespace character (if * ? quantifiers are not present), and that's not what you have if you chomp off the newline. You may be interested to investigate the $ \z \Z line end anchors. In your particular case, \Z (big-Z) might be useful to "Match only at end of string, or before newline at the end" (see perlre); a \Z would match match the end of either a chomp-ed or un-chomp-ed line (assuming you're chomp-ing newlines).

Update: Fixed ^ vice $ in "... the ^ \z \Z line end anchors." per Lotus1's /msg. Thanks!

Give a man a fish: <%-{-{-{-<

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Re^4: \s does not match end-of-line by glendeni (Sexton) on Feb 06, 2018 at 05:14 UTC
Since I'm matching chomped single lines, not multiple lines, is there something which "\Z" can do which "$" does not?? (Did not know about "\z" anchor - that may have been put in after I learned perl in 1996.)	[reply]
Re^5: \s does not match end-of-line by AnomalousMonk (Archbishop) on Feb 06, 2018 at 06:08 UTC
My personal regex best practices (solidly in line with TheDamian's as given in his PBP book) include reserving `^ $` for matching around embedded newlines (which means that the `/m` regex modifier is always asserted) and using `\A \z \Z` as "absolute" string start/end anchors. To the best of my recollection, `\A \z \Z` were introduced with Perl 5, sometime prior to 1996 (update: but see hippo's correction). ... is there something which "\Z" can do which "$" does not?? It's the other way around: `^ $` match also around embedded newlines (with the ever-present `/m` modifier), while `\A \z \Z` match only at string start/end; hence, in a sense, they do less. The advantage of this practice is that you never have to think about what `^ $` do; also, `\A \z \Z` cannot be modified. Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]
Re^6: \s does not match end-of-line by hippo (Archbishop) on Feb 06, 2018 at 10:28 UTC
To the best of my recollection, `\A \z \Z` were introduced with Perl 5, sometime prior to 1996. Not quite. `\z` at least was introduced with perl 5.005 in 1998. I believe that the others do predate this, however.	[reply] [d/l] [select]