When you read in a line from a file like this
while(<PAGE>),
$_ stores the whole line you just read in. So
print "$_" prints the whole line.
To print out only part of the line, you need to use a capturing regular expression. You will also need to escape the ( and ) because those have special meaning in a regular expression. So to get the stuff between the parenthesis after pond:
print $1 if (/pond\(([^)]*)\)/);
[^)]* means match everything up until the first closing ).
([^)]*) says to capture it and store it in $1.
\( and \) say "treat ( and ) as normal parenthesis".
See perlretut for more information.
Best, beth
Update:Fixed typo, as per AnomalousMonk below. Thanks.
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