my @matches = $pdus =~ /[^{}]+ | \{ (?: (?R) | [^{}]+ )+ \} /gx;

__END__
$VAR1 = [
          '[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx: UDT',
          '{
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line2: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line3: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line4: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line5: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:    	      line6: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line7: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line8: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line9: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line10 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line11: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line12: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line13: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line14: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line15: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line16: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line17: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line18: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line19: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line 20 {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line21 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line22 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line23 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line24: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line25: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line26 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line27: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line29 data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line30: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line32: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line33: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line34: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line35: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line36: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line38: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line39: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line40: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line42 =	{
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line43: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line44: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line45: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line46: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line47: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line48: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line49: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line50: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line51: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line52: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line53: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line55: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line56: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line57: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line58: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line59: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line60 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line61: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line63: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line65 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line66 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line67: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line69: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line70: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line72 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line73: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line74: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line75: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line76: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line77: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line78: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line79: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line80: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line81: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line82: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line84: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line85: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line86: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line87: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line88: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line89: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line90: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line91: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line92: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line93: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line94: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line95: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line98: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line99: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line100: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line104: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line105: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line106: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line107: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line110: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		    }'
        ];

##</code><code>##

my @matches = $pdus =~ /\{ (?: (?R) | [^{}]+ )+ \}/gx;

__END__
$VAR1 = [
          '{
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line2: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line3: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line4: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line5: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:    	      line6: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line7: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line8: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line9: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line10 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line11: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line12: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line13: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line14: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line15: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line16: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line17: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line18: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line19: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		     line 20 {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line21 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line22 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line23 data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line24: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line25: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line26 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line27: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line29 data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line30: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line32: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    line33: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line34: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line35: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line36: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line38: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line39: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line40: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    line42 =	{
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line43: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line44: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line45: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line46: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line47: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line48: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line49: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line50: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line51: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line52: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line53: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					line55: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line56: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line57: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line58: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line59: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line60 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line61: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line63: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line65 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line66 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line67: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line69: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line70: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line72 = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line73: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line74: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line75: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line76: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line77: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line78: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line79: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line80: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line81: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line82: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						line84: data = {
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line85: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line86: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line87: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line88: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line89: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line90: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line91: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line92: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line93: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line94: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						    line95: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:						}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line98: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line99: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					    line100: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:					}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line104: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line105: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line106: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:				line107: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			    }
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:			line110: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		    }'
        ];

##</code><code>##

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

sub fileParse {
    my ( @files ) = @_;

    my $refHash = {};

    open(my $fh, '<' , $files[0])
	or die "Could not open file '$files[0]' $!";

    my $pdus = do { local $/; <$fh> };

    close $fh
	or die "Could not close file '$files[0]' $!";

    chomp( $pdus );

    # my @matches = $pdus =~ /\{ (?: (?R) | [^{}]+ )+ \}/gx;
    my @matches = $pdus =~ /[^{}]+ | \{ (?: (?R) | [^{}]+ )+ \} /gx;

    # Trim leading and trailing white spaces
    s/^\s+|\s+$//g for (@matches);

    %{$refHash} = @matches;
    return $refHash;
}

my $final = fileParse( @ARGV );

my @sorted = ();
push @sorted, $_ for (sort keys %{$final});

print Dumper \@sorted;

__END__
$VAR1 = [
          '[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx: UDT',
          '[     12] 25/2/2017-19:02:06.996 proces_name thanos-Tx: UDT',
          '[     13] 25/2/2017-19:02:07.185 proces_name thanos-Rx: UDT',
          '[     14] 25/2/2017-19:02:07.227 proces_name thanos-Tx: UDT',
          '[     17] 25/2/2017-19:02:07.413 proces_name thanos-Tx: UDT',
          '[     18] 25/2/2017-19:02:09.794 proces_name thanos-Rx: UDT'
        ];