I don't feel good to use an old version of search.php. I don't know exactly what has been changed in this file...
I analyzed this file by myself, but didn't found the part where the keyword lenght is tested...
Quote (BUG: search function
This is not a bug - if you review the changelog, you will see that this was a deliberate change to the software
I browsed through the changelog of phpbb
. The change you brought up is listed in "Changes since 2.0.0":
"Decreased minimum search word size to 3 chars"
If my memory serves me right, "user post search" was still possible in phpbb 2.0.11 for nicknames with a length of 2 letters.
My proposition for the next phpbb 2 version is to enable at least user search with two letters...