[H-GEN] A perl query

[Three Blokes]

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Jason Parker-Burlingham <jasonp at uq.net.au> wrote:
>                 s/$regex/$subs{$1}/g;

One more clarification if you don't mind and then I will understand it all.
In the above line, how does this expression know which value from %keys to
substitute for the $regex that it's matched?, I'm assuming the {$1} is it,
but what I want explained is how the compiler realises that $1 means the
value that currently matches from $regex?, is that just a standard (so in
every case where a match is found $1 will hold the value that was matched?

Thanks again guys for all your help, and sorry to be a nuisance.

   Joe


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