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Editorial Team
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Asked: 2026-05-19T23:34:07+00:00

Today, while writing a regex to match a prompt output in order to interact

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Today, while writing a regex to match a prompt output in order to interact with a program through IPC::RUN, I came across an inexplicable failure in matching a simple regex.

$ perl -E 'say "OK" if "mbox user@testdomain.it> " =~ /mbox\s+.*@.*> /s'
$
$ perl -E 'say "OK" if "mbox user@testdomain.it> " =~ /mbox\s+.*@t.*> /s'
OK
$

I thought it could be a problem of interpolation of «@» as a sigil, but

$ perl -E 'say "OK" if "mbox user@testdomain.it> " =~ /mbox\s+.*\@.*> /s'
$

It’s so simple I can’t seem to understand where the problem may lie.

Perl version is 5.10.1 on an Ubuntu 10.4

Any ideas?

Thanks in advance

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1 Answer

  1. Editorial Team

    I think you were on the right track but looking at interpolation in the wrong place.

    Consider what happens to the @ in your string rather than your regex.

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