htaccess help - need to redirect urls with invalid caracters to homepage

I have the following ReWrite that I am happy with and works;
RewriteCond %{QUERY_STRING} ^param=([a-zA-Z0-9_-]*)$
RewriteRule ^index\.php$ /ff/%1? [R,L]

what I want is ReWrite rule that redirects any urls, with a parameter not matching above [a-zA-Z0-9_-] to go to the home page /ff/

i.e.
/ff/index.php?param=aaa'bbbb
/ff/index.php?param=aaa*bbbb
/ff/index.php?param=aaa+bb(bb
/ff/index.php?param=a^aa@bb#bb

would all redirect to  /ff/
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thydzikAsked:
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thydzikConnect With a Mentor Author Commented:
okay, I did this in a dodgy way, but it works.

Any invalid characters cause a 404 not found,
and I redirect all 404 errors to the index page.
ErrorDocument 404 http://thydzik.info/ff

# The following redirects to a nice looking url whenever a value is searched
RewriteCond %{QUERY_STRING} ^param=([^&]*)$
RewriteRule ^index\.php$ /ff/%1? [R,L]

# The following rule writes any nice url to the search variable
RewriteRule ^([a-zA-Z0-9_-]+)$ index.php?param=$1&a [L]

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Brad HoweConnect With a Mentor DevOps ManagerCommented:

Why not just reverse it. The ! is the negation of a condition.  So 

# Condition GOOD, forward.
RewriteCond %{QUERY_STRING} ^param=([a-zA-Z0-9_-]*)$
RewriteRule ^index\.php$ /ff/%1? [R,L]

#ELSE Condition BAD Homepage
RewriteCond %{QUERY_STRING} !^param=([a-zA-Z0-9_-]*)$
RewriteRule ^index\.php$ /ff/ [R,L]

Cheers, Hades666
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thydzikAuthor Commented:
this sounded good. but the problem is it loops for all root sites (/ff/) but also all /ff/aaaabbbb derivatives.

note, i have added the '?' the the end to stop the parameter string showing ie.

RewriteCond %{QUERY_STRING} !^param=([a-zA-Z0-9_-]*)$
RewriteRule ^index\.php$ /ff/? [R,L]
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arober11Connect With a Mentor Commented:
You could Just change the "*" (Zero or more) to a "+" (One or more)


RewriteCond %{QUERY_STRING} !^param=([a-zA-Z0-9_-]+)$
RewriteRule ^index\.php$ /ff/? [R,L]


OR logically the same:

RewriteCond %{QUERY_STRING} ^param=[a-zA-Z0-9_-]*[^a-zA-Z0-9_-]+
RewriteRule ^index\.php$ /ff/? [R,L]
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Brad HoweDevOps ManagerCommented:
Hi,
Off to bed at the moment but could you not try to use (\W)+ as your regular expression or a variation of

\w Any word character [a-zA-Z0-9_]
\W Any non-word character [^a-zA-Z0-9_]

It will only accept not A-Z0-9a-z_ characters.

eg: This is not tested but something like this.
RewriteCond %{QUERY_STRING} !^param=[^a-zA-Z0-9_=-]+$
RewriteRule ^index\.php$ /ff/? [R,L]

-Hades666
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thydzikAuthor Commented:
guys, apologies for letting this sit. give me a week and a bit more before I can try these out.
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thydzikAuthor Commented:
okay, still can't get this to work, here is all my htaccess;

# The following redirects to a nice looking url whenever a value is searched
RewriteCond %{QUERY_STRING} ^param=([a-zA-Z0-9_-]*)$
RewriteRule ^index\.php$ /ff/%1? [R,L]

# The following cathes everything else and redirects to the homepage
RewriteCond %{QUERY_STRING} ^param=[a-zA-Z0-9_-]*[^a-zA-Z0-9_-]+
#RewriteRule ^index\.php$ /ff/? [R,L]

# The following rule writes any nice url to the search variable
RewriteRule ^([a-zA-Z0-9_-]+)$ index.php?param=$1&a [L]

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