Rewrite in Apache configuration

What does the following line use in apache configuration file :

RewriteRule ^/booking(/)?$ /tc/directory/bookextension.htm [R,L]
RewriteRule ^/cgi-bin/(.*)$1 [P,L,NS]

#1 Any meaning for ^/, (/)?$ and [R,L} ... ? Tks
#2 Any meaning for (.*) and [P,L,NS]  ?
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Zephyr ICTCloud ArchitectCommented:
It's basically regex and mod_rewrite rules, there are nice cheat-sheets here and here


#1 [R,L]= Redirect to new URL, Last - stop processing rules (so it redirects everything from the directory booking to the other link, using the given regex strings.
#2 [P,L,NS]= Proxy, stop processing rules and ignore subrequests.

The regex is usually not that complex, some possibilities:

.      Matches any single character (eg: h.t will match hat, hit, hot, ...)
+      Repeats the previous match one or more times      (eg: h+ will match hh, hhh, hhhh)
*      Repeats the previous match zero or more times.      (same as previous but also matches empty string)
?      Makes the match optional.       (eg: choi?re will match choire and chore)
^      Called an anchor, matches the beginning of the string (eg: ^h matches a string that starts with h)
$      The other anchor, this matches the end of the string.      (eg: same as previous but matches end)
( )      Groups several characters into a single unit, and captures a match for use in a backreference

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Apache Web Server

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