Re: Extracting text from a line

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Re^2: Extracting text from a line by targetsmart (Curate) on Jul 12, 2010 at 05:47 UTC
`print $fh $uid if $uid;` you meant to say `print $fh $1 if $uid;` I guess. update almut was right I thought it was scalar context, missed to notice that "(" ")" => "list context" ,my mistake :-). Thanks to almut and pemungkah Vivek -- 'I' am not the body, 'I' am the 'soul/consciousness', which has no beginning or no end, no attachment or no aversion, nothing to attain or lose.	[reply] [d/l] [select]
Re^3: Extracting text from a line by almut (Canon) on Jul 12, 2010 at 07:28 UTC
What's the difference, semantically? Note that in list context (`my ($uid) = ...`), the match operation returns the captures, so `$uid` holds the same value as `$1`. If there is no match, both values are `undef`.	[reply] [d/l] [select]
Re^4: Extracting text from a line by pemungkah (Priest) on Jul 13, 2010 at 00:37 UTC
Vivek, I strongly disagree with you here because of the fact that the number variables are very fragile: they are global to every pattern match. If someone else comes along and adds (for instance) a"harmless" subroutine call that sometimes does a pattern match of its own between the match and the usage of $1, then the results are unpredictable because the intervening match has reused the global variables. If you always capture the value in a separate variable immediately, you're safe from this potential bug.	[reply]