Confusion in working upon regex with /m

abdan has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Confusion in working upon regex with /m by ikegami (Patriarch) on Nov 12, 2021 at 05:07 UTC
If I understand correctly, you want to do something like this: `/^abc$\ndef$/` [download] But you are faced with `$\` getting treated as a variable name. You could use one of the following instead: `/^abc(?:$)\ndef$/m` [download] `/^abc$(?:\n)def$/m` [download] `/ ^ abc $ \n def $ /xm` [download] But the following ones are better: `/^abc\ndef$/m` [download] `/ ^ abc \n def $ /xm` [download]	[reply] [d/l] [select]
Re: Confusion in working upon regex with /m by LanX (Saint) on Nov 12, 2021 at 00:57 UTC
see `\Z` in `perlretut` Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l]
Re: Confusion in working upon regex with /m by Fletch (Bishop) on Nov 12, 2021 at 03:54 UTC
If you use `/x` you can separate whatever "variable looking" bits follow (or proceed, for that matter) with whitespace. `qr/blah \s+ blah $ yackety \s+ schmakety/mx` Edit: Derp; bad example is bad; see below for better. The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l] [select]
Re^2: Confusion in working upon regex with /m by ikegami (Patriarch) on Nov 12, 2021 at 04:58 UTC
That will never match. `$` has to be followed by a line feed or EOS, and you also require that it's followed by a `y`. Those are mutually exclusive requirements.	[reply] [d/l] [select]