While the initial responses offer valuable suggestions on the reset issue, I believe the authors (update+correction: Blooknok excepted) mis-read the question.

OP asks "to select lines which do not have : at the first word."

I read first word (in this context and OP's data sample) as the characters prior to the first space.

Hence:

#!/usr/bin/perl
use 5.016;
use warnings;

# 1059623
# select lines which do not have : at the first word. 

my @arry=(
        'bond0.2 Link encap:Ethernet',
        'bond4.3:6 Link encap:Ethernet',
        'bond3 Link encap:Ethernet',
        'bond5:0 Link encap:Ethernet',
        'bond1.5:2 Link encap:Ethernet',
        'bond2.6 Link encap:Ethernet'
);

my $elem;
for $elem(@arry) {
       if($elem =~ /(bond[^:]+?)\s+Link.*$/) {  # note negated char cl
+ass, minimally
                my $match = $1;                 # You may find it 'goo
+d practice' to extract 
                                                # any value in $1 to a
+nother var ASAP
                say $match . " The colon, if any, is AFTER the first w
+ord \n\tin | \"$elem\" |";
        } else {
                say "Matching colon in first word (ie, before a space)
+\n\t in | \"$elem\" |";
        }
}

=head

C:\>1059623.pl
bond0.2 The colon, if any, is AFTER the first word
        in | "bond0.2 Link encap:Ethernet" |
Fails OP's criterion; matching colon in first word (ie, before a space
+)
         in | "bond4.3:6 Link encap:Ethernet" |
bond3 The colon, if any, is AFTER the first word
        in | "bond3 Link encap:Ethernet" |
Fails OP's criterion; matching colon in first word (ie, before a space
+)
         in | "bond5:0 Link encap:Ethernet" |
Fails OP's criterion; matching colon in first word (ie, before a space
+)
         in | "bond1.5:2 Link encap:Ethernet" |
bond2.6 The colon, if any, is AFTER the first word
        in | "bond2.6 Link encap:Ethernet" |

C:\>

=cut
[download]

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