Rewrite URL ..... HELP

[ido]

I've create un litle ereg to do an url rewritng ... It's work but since few time apache give me error 500 internal server error ....

My Ereg is :

#Options +FollowSymlinks
RewriteEngine on
RewriteRule ^([a-Z]+)-([0-9]+)\.html$ main.php?QUERY=ANNU&mot=$1&CURENT=$2 [L]

Error apache log :

[Sun Jun 15 18:07:00 2003] [alert] [client 81.51.212.219] /home/httpd/vhosts/mondesexy.com/httpdocs/.htaccess: RewriteRule: cannot compile regular expression '^([a-Z]+)-([0-9]+)\.html$'


It's very streng becose it's random ... it's do error just sometime ....

[swedguy]

[a-Z]

a-Z is not valid (one lower caps and one upper caps)
[a-z] is the correct for all lower caps.
[a-zA-Z] is valid for both lower and upper.