the error message I was getting (" is only avaliable") can be explained by a failed match or an empty capture.
A failed match doesn't clear $1
>perl -le"'a'=~/(.)/; 'b'=~/c/; print $1"
a
$1 is cleared by a successful match with no captures, or capturing a zero-length string.
>perl -le"'a'=~/(.)/; 'b'=~/./; print $1"
>perl -le"'a'=~/(.)/; 'b'=~/(.*?)/; print $1"
Apart from the typo in "available"
It's a feature to make the error message easily findable in the source. *wink*
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