> 1. RewriteRule ^topics/([a-zA-Z-]+)

- inside a set has a special meaning so you have to escape it:
RewriteRule ^topics/([a-zA-Z\-]+)

> 2. RewriteRule ^topics/([a-zA-Z+]-)
> 3. RewriteRule ^topics/([a-zA-Z-]-)

The + at the end means 'one or more times the previous', so changing it
into a - doesn't work.

Joost


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