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How do I get the value of a number that is part of a string?

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Contributed by vroom on Mar 02, 2000 at 23:27 UTC
Q&A  > numbers


Answer: How do I get the value of a number that belongs to a string??
contributed by chromatic

Perl will automatically do the right thing with a scalar depending on the context in which you use it. If you were to say:

my $x = "1"; my $y = "2"; print $x + $y, "\n";
you'll get 3. If you say:
my $x = "1"; my $y = "2"; print $x . $y, "\n";
you'll get 12 ("2" appended to "1"). To force interpretation in a numeric context, you can try:
my $x = "10abc"; print $x + 0, "\n";
and you'll get 10. Note that this only works on scalars starting with digits. Strip them out with a regex if you need to.
Answer: How do I get the value of a number that is part of a string?
contributed by lalitbans

$_ = "answer4u"; /(\d+); $num = $1;
or:
$_ = "answer4u"; ($num) = /(\d+)/;

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