You used elsif ($number =~ /^\d+\z/ ) {, but the perlfaq4 used the equivalent of if ($number =~ /^\d+\z/ ) {.

In reply to Re: [SOLVED] How do I determine with a regular expression whether a scalar is a number/whole/integer/float? by ikegami
in thread [SOLVED] How do I determine with a regular expression whether a scalar is a number/whole/integer/float? by thanos1983

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