[vox-tech] dumb perl question

[Peter Jay Salzman]

hi jim,

thanks for helping me out!  

the string that i'm matching though is $_, not $temperature.  $_ holds a
filename, like "100.energy", and i'd like to extract the "100" from the
filename and put it in $temperature.

doesn't

	$temperature =~ s/(\d+).*/$1/;

assume that $temperature is the object holding "100.energy"?

note that i'm being greedy here -- this DOES work:

	/(\d+).*/;              # match "100" in $_
	$temperature = $+;      # put it in $temperature

i just want to do it in a single line.  :)   also, i'd like to do it
without destroying the contents of $_ if possible.

pete


begin Jim Angstadt <jimajima9@yahoo.com> 
> --- Peter Jay Salzman <p@dirac.org> wrote:
> <snip>
> > 	/(\d+).*/;
> > 	$temperature = $+;
> 
> $1 holds the \d+ matching, because it has parens. 
> Multiple sets of parens will match $1, $2, ... based
> on the left to right order of the parens.
> 
> If $temperature already had one or more digits \d+ and
> some other junk, replace digits and junk with digits:
> 
> $temperature =~ s/(\d+).*/$1/; 
> 
> Note, if $temperature has a newline character in the
> middle somewhere, then .* will not match it.
> 
> ---
> Jim
> 
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-- 
The mathematics [of physics] has become ever more abstract, rather than more
complicated.  The mind of God appears to be abstract but not complicated.
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