Matching a non-match

Hi all,

Browsing a directory listing, sometimes I hit lines like these:
./spool/exim/input/1FM8sl-00004n-Ix-H
./spool/exim/input/1FM8sn-00004u-OF-D
./spool/exim/input/1E9dsQ-00004f-MO-D
[... thousands of similar lines ...]

How can I use "/" to find the next line not matching the above
pattern? I've tried the following (and several variations):
/\(.*exim.input\)\@<!.*

Regards,
Albert Wik.

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