my @file=<FILE>;

You have errors in your code preventing success:

First, quote your strings:

my $logpattern1='rrcConnection';
my $logpattern2='measurementReport';
my $logpattern3='Event';
[download]

Second, remember the name of your open filehandle:

open(LOGFILE,"$filepath");
my @file=<LOGFILE>;
[download]

#.........^^^

Cheers, Sören