Re^3: passing arrays

Actually all three arguments to split [pattern;[, expression, limit]] are optional.

I find that statement misleading. See the 'template' at the top of spilt:

split /PATTERN/,EXPR,LIMIT
split /PATTERN/,EXPR
split /PATTERN/
split
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This implicitly (and rightly) excludes:

split EXPR

Which is exactly what the OP tries to do in the line:

@mails = split ('$line');

This is why the OP's code generates the following error:

Use of uninitialized value $_ in split at XX.pl line YY.

IOW, the 'expression' argument is optional only if the 'pattern' argument is present.

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Re^4: passing arrays by Fletch (Bishop) on Apr 20, 2008 at 04:07 UTC
In that case the expression to be split is defaulting to `$_`, but at the time of his call it contains `undef`. You don't have to explicitly provide the text to split, but if you don't do so you should have what you want to split in `$_` or it's not going to be very useful. The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l] [select]