Re: Argument "" isn't numeric in numeric le (<=)

* means zero or more times, and almost anything can match zero times, which is why one or more of $1 $2 $3 $4 is undefined

You probably want to investigate the BioPerl modules

Comment on Re: Argument "" isn't numeric in numeric le (<=)

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Re^2: Argument "" isn't numeric in numeric le (<=) by ikegami (Patriarch) on Aug 24, 2009 at 14:41 UTC
No, not undefined. If the `\d` in `/(\d)/` matched zero times, `$1` would be the empty string*. You found the problem (since the OP is having problems with an empty string), it's just the description that's flawed. `>perl -we"my $x = '' < 2" Argument "" isn't numeric in numeric lt (<) at -e line 1. >perl -we"my $x = undef() < 2" Use of uninitialized value in numeric lt (<) at -e line 1.` [download]	[reply] [d/l] [select]
Re^3: Argument "" isn't numeric in numeric le (<=) by Anonymous Monk on Aug 25, 2009 at 00:27 UTC
My apologies ikegami, how ignorant of me to use undefined when clearly it wasn't numeric as per the OP.	[reply]
Re^2: Argument "" isn't numeric in numeric le (<=) by hotel (Beadle) on Aug 24, 2009 at 14:31 UTC
Thank you very much, my little script works pretty fine right now. I should've checked it more carefully before posting such a thing. Thank you.	[reply]