The pure Perl solution will be faster, more portable, and much sexier (substitute your actual filehandle opened with open for <DATA>):
#!/usr/bin/env perl
use 5.010;
use warnings;
my @times = map { /^(?:top - (..:..:..))/ } <DATA>;
say for @times;
__DATA__
top - 00:35:18 up
top - 01:23:45 other junk
completely different format altogether
not - 01:23:45 can't fool me!
top - 02:35:46
top - 03:46:07
Output:
00:35:18
01:23:45
02:35:46
03:46:07
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are good places to start.
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