I recently upgraded to Ubuntu 14.04 with no visible issues.

The url below is generated in my web page code and is sent to the mapserver:

http://hawken.sdsmt.edu/cgi-bin/mapserv?mode=itemnquery&qformat=png&map=/gisdata/sd/sd_x-printform.map&qlayer=surveys&qitem=archive&qstring=/ESD-0498/i&layer=sites&layer=drg024k_13N&layer=drg024k_14N&layer=drg250k_13N&layer=drg250k_14N&layer=sd_plss&layer=sd_tr&mapsize=480+480&mapext=shape&scaledenom=932875

It worked fine in Ubuntu 13.10 using Mapserver version 6.2.1-3 and generated a 
map properly. It no longer works in mapserver 6.4.1-2 in Ubuntu 14.04. Now I 
get the error message

mapserv(): Web application error. Parameter 'qstring' value fails to validate. 
msValidateParameter(): Regular expression error. Parameter pattern validation 
failed.

None of my underlying data or map files have changed. I'm completely mystified 
as to why this is happening. I hope I don't have to revert to Ubuntu 13.10, but 
I have a backup in case I need to.
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