#! perl -slw
use strict;

my( $target_name, %probes );

$_ = <DATA>; # Prime the pump.

do {
      # extract the target name
	$target_name = $1 if m[( \d{7} ) _at: \d{3} : \d{3} ]x;

	while( m[$target_name] ) { 
     # process the record containing the current target name
		my $probe = <DATA>; # Read the probe
		chomp $probe;

            # save it in an HoA keyed by the target name
		push @{ $probes{ $target_name } }, $probe;

		last unless defined( $_ = <DATA> ); # get the next line;
	}
} until eof DATA; # till done

print $_, ' : ', join', ', @{ $probes{ $_ } } for keys %probes;

__DATA__
probe:MOE430A:1415670_at:549:177; Interrogation_Position=2513; Antisense;
GAGGAAACGTTCACCCTGTCTACTA
probe:MOE430A:1415670_at:467:433; Interrogation_Position=2521; Antisense;
GTTCACCCTGTCTACTATCAAGACA
probe:MOE430A:1415670_at:254:643; Interrogation_Position=2533; Antisense;
TACTATCAAGACACTCGAAGAGGCT
probe:MOE430A:1415670_at:54:269; Interrogation_Position=2556; Antisense;
CTGTGGGCAATATTGTGAAGTTCCT
probe:MOE430A:1415670_at:405:339; Interrogation_Position=2583; Antisense;
GAATGCATCCTTGTGAGAGGTCAGA
probe:MOE430A:1415670_at:60:395; Interrogation_Position=2597; Antisense;
GAGAGGTCAGACAAAGTGCCAGAAA
probe:MOE430A:1415670_at:284:165; Interrogation_Position=2619; Antisense;
AAAACAAGAACACCCACACGCTGCT
probe:MOE430A:1415670_at:622:145; Interrogation_Position=2634; Antisense;
ACACGCTGCTGCTAGCTGGAGTATT
probe:MOE430A:1415670_at:291:661; Interrogation_Position=2804; Antisense;
TATCTTGTCCAACACTACGTCGAAG
probe:MOE430A:1415670_at:146:701; Interrogation_Position=2956; Antisense;
TTGTCACCATGCCTGCAAGGAGAGA
probe:MOE430A:1415671_at:116:525; Interrogation_Position=1156; Antisense;
GGAACAGGAATGTCGCAACATCGTA
probe:MOE430A:1415671_at:655:137; Interrogation_Position=1173; Antisense;
ACATCGTATGGATTGCTGAGTGCAT
probe:MOE430A:1415671_at:398:139; Interrogation_Position=1232; Antisense;
GGCTGATCACATCCAAAAAGTCATG