I had this problem before. I ended up writing a utility script I call 'grange' for 'grep a range'. It depends on the fact that I'm usually parsing logfiles so the dates are sequential. So I used the range operator .. to match lines between the start and end regexes. If that matches your situation, then here's the whole utility:

#!/usr/bin/perl -n

BEGIN {
    print "Usage: $0 <start pattern> <end_pattern>\n" and exit unless 
+@ARGV == 2;
    $start = shift @ARGV; $end = shift @ARGV;
}

next if 1 .. /$start/;
last if /$end/;
print
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HTH!