Using grep to match md5 hashes

Question

How can I match md5 hashes with the grep command?

In php I used this regular expression pattern in the past:

/^[0-9a-f]{32}$/i

But I t

Answer 1

Meh.

#!/bin/sh
while IFS=: read filename filesize hash
do
  if [ -z "$hash" ]
  then
    echo "$filename"
  fi
done < hashes.lst