Wusage Rewrite Rules with Regular Expressions

I have edited Wusage's configuration file to rewrite the url before Wusage engine process the url. The Wusage's Rewrite Rules below shows the use of Wusage's Regular Expressions.

Wusage's documentation on the usage of Regular Expressions is not well documented. There were no examples to write Regular Expressions with Replacement using Backreferences.

NOTE: Wusage's regular expression must begin with @

After some trial and error, here is what I have learnt.

Example 1:
URL to match:

/flash/header.swf?rnd=0.24753951619780357

Regular expression:
@^([^\.]*\.swf)\?.*$

Replacement expression:
\1 Returns the entire string matched by the regular expression, e.g. /flash/header.swf?rnd=0.24753951619780357
\2 Returns the first sub-match, e.g. ([^\.]*\.swf), /flash/header.swf

Example 2:
URL to match:

/resize_image.aspx?FilePath=/resource_docs/SEA_Sewar.jpg&width=640

Regular expression:
@^/resize_image\.aspx\?FilePath=([^\.]*\.(jpg|gif|tif|bmp))&.+$

Replacement expression:
\1 Returns the entire string matched by the regular expression, e.g. /resize_image.aspx?FilePath=/resource_docs/SEA_Sewar.jpg&width=640
\2 Returns the first sub-match, e.g. ([^\.]*\.(jpg|gif|tif|bmp)), /resource_docs/SEA_Sewar.jpg

Wusage's config file snippet:

#Rewrite Rules...
rewrite
# /flash/header.swf?rnd=0.24753951619780357
# /flash/header_exhibition.swf?rnd=0.7556053221950332
# /flash/header_learning.swf?rnd=0.0028210814865592404
# /flash/header_visitus.swf?rnd=0.01042118194914482
url @^([^\.]*\.swf)\?.*$ \2

# /resize_image.aspx?FilePath=/resource_docs/SEA_Sewar.jpg&width=640
url @^/resize_image\.aspx\?FilePath=([^\.]*\.(jpg|gif|tif|bmp))&.+$ \2

url /exhibitions/events.asp?* /exhibitions/events.asp
url /exhibitions/eventdetail.asp?* /exhibitions/eventdetail.asp
url /exhibitions/exhibitions.asp?* /exhibitions/exhibitions.asp
url /exhibitions/booking.asp?* /exhibitions/booking.asp
url /exhibitions/thankyou.asp?* /exhibitions/thankyou.asp
url /exhibitions/booking_clear.asp?* /exhibitions/booking_clear.asp
url /exhibitions/ticketdetail.asp?* /exhibitions/ticketdetail.asp

url /booking/login/loginaction.asp?* /booking/login/loginaction.asp
url /booking/payment/add_booking.asp?* /booking/payment/add_booking.asp
url /booking/report/attendence.asp?* /booking/report/attendence.asp
url /booking/report/payment_details.asp?* /booking/report/payment_details.asp
url /booking/report/details.asp?* /booking/report/details.asp
url /booking/payment/details.asp?* /booking/payment/details.asp
url /booking/report/excel_details.asp?* /booking/report/excel_details.asp
url /booking/report/excel_payment_details.asp?* /booking/report/excel_payment_details.asp

url /pressroom/releasesdetail.asp?* /pressroom/releasesdetail.asp
url /pressroom/newsdetail.asp?* /pressroom/newsdetail.asp
url /pressroom/news.asp?* /pressroom/news.asp
url /pressroom/releases.asp?* /pressroom/releases.asp

url /learning/imagepopup.asp?* /learning/imagepopup.asp
url /learning/museumartefacts.asp?* /learning/museumartefacts.asp

url /themuseum/galleries2.asp?* /themuseum/galleries2.asp
end rewrite