Rewrite Rule

Just off the top of my head, this should do it:

RewriteRule ^search\/(.+) http://www.yourdomain.com/search [R=302]

Explanation of the syntax above:

^ indicates the start of the match

\ is the escape character, so \/ means escape the forward slash (probably unnecessary, but does no harm)

() is a capture group

. means any character

+ means one or more of

So the whole regex means:

starting at the current position in the folder hierarchy, match

search/

followed by one or more characters.

N.B. Importantly, it is the R flag which indicates the type of redirect, so you need R=302, (not L=302, which doesn't exist)