... local $/ = ""; ... will cause the entire file to be slurped ...

From  perldoc -v "$/" (see also perlvar): 

HANDLE->input_record_separator( EXPR )
$INPUT_RECORD_SEPARATOR
$RS
$/      The input record separator ... 
        treating empty lines as a terminator if set to the null string
+ ...
        You may set it to ... "undef" to read through the end of file.
        ...

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The idiomatic Perl statement would be something like
    my $entire_data = do { local $/;  <$filehandle>; };
(if you don't use something like File::Slurp).

Give a man a fish:  <%-(-(-(-<

In reply to Re^2: how to extract multiple pattern into array by AnomalousMonk
in thread how to extract multiple pattern into array by herman4016

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