They are call backreferences, used in regular expression as buffer where
you can store pieces of the result collected in the regular expression.
eg. if you have this
"123 456" =~ /(\d*) (\d*)/;
$1 will equal to 123 while $2 will equal to 456
If you have the 'proramming perl' book from oreilly, refer to page 31,
it has a very detail description of what backreferences is.
Tor.
lyf wrote:
> hi, I am a perl beginner, and I am confused by $1.
> what does $1 ($2,and so on) mean?
> and how to use them?
>
> thanks
>
> yuefu li
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