use strict;
use warnings;
use 5.010;

my $date     = 'Wed Mar 10 10:10:48 IST 2010';
my @parts    = split /[ :]/, $date;
my $valueStr = <<VALS;
Fri_Jan_29_14:30:22_v09.11-e024_1 Wed_Jan_27_14:30:11_v09.11-e022_1
Mon_Mar_08_14:30:04_v09.11-s008_1 Thu_Jan_28_14:30:13_v09.11-e023_1
Tue_Nov_24_15:54:18_v09.11-e005_1 Tue_Mar_01_14:30:08_v09.10-p002_1
Tue_Nov_24_17:31:07_v09.10-p001_1 Wed_Nov_25_10:27:43_v09.11-e002_1
Wed_Mar_25_10:27:43_v08.11-e002_1
VALS
my @values = split /[\s\n]+/, $valueStr;

for my $value (@values) {
    next if $value !~ /_$parts[1]_/;

    given ($value) {
        when (/(v09.11-[a-z]\d{3})/)    {print "$1\n"; continue};
        when (/(v09.10-[a-z]\d{3})/)    {print "$1\n"; continue};
        when (/(v08.\d{2}-[a-z]\d{3})/) {print "$1\n"; continue};
    }
}