You seem to be misunderstanding how && works in this case. When you say:

    $_ =~ /a/i && /e/i && /i/i && /o/i && /u/i

that essentially gets extrapolated to:

    ($_ =~ /a/i) && ($_ =~ /e/i) && ($_ =~ /i/i) && ($_ =~ /o/i) && ($_ =~ /u/i)

Then when you write:

    $one_line =~ /a/i && /e/i && /i/i && /o/i && /u/i

it similarly gets extrapolated to:

    ($one_line =~ /a/i) && ($_ =~ /e/i) && ($_ =~ /i/i) && ($_ =~ /o/i) && ($_ =~ /u/i)

Notice how all the subsequent matches look in $_? The only reason your first example works is because the match operator defaults to matching against $_. The solution is either to bind each and every match to the variable you want to match, or to combine all the regexes into one, like so: $one_line =~ /a|e|i|o|u/i.

Update: replies pointed out that my combined regex was not the same as the original intent.

Update: I've posted a single-regex solution deeper in the thread. It may have problems that I'm not aware of, but seems to test out OK.

In reply to Re: $_ works, $my_variable doesn't? by revdiablo
in thread $_ works, $my_variable doesn't? by C_T

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