Please, test your code.
\d* will match 0 (ZERO) or more digits.
Thus, it will happily match an empty string at the
beginning of a string like "abc123" and return a 0 length
string. Try it.
The right expression to use in this case is \d+.
Moreover, a capturing regular expression should
always be used with a test:
my $variable = "abc123";
if ( $variable =~ /(\d+)/)
$num = $1;
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