Question

I’m attempting to rewrite all all urls that are 4 exactly characters but allow other urls to be rewritten to it’s name +.php

domain.com/a4Lv/ to domain.com/file.php?id=a4Lv
domain.com/longerThan4Chars/ to domain.com/longerThan4Chars.php

Is rewriting based on length possible?

Answer 1

This should work. I prefer to specify which characters are allowed (first option) but if you want to allow anything, use the second

RewriteRule ^([a-zA-Z0-9]{4})(/?)$ /file.php?id=$1 [QSA,L]
RewriteRule ^(.{4})(/?)$ /file.php?id=$1 [QSA,L]

Breakdown:

[a-zA-Z0-9]  limits it to letters and numbers
{4}          the length of the id
(/?)         optional trailing slash