Your pattern allows for upper case letters and you're passing lower case. Hence the error.
Steve From: Li Quansheng [mailto:quansheng...@gmail.com] Sent: Saturday, April 21, 2012 10:38 AM To: mapserver-users@lists.osgeo.org; Lime, Steve D (DNR) Subject: mapserver 5.6 CGI output GeoJSON format 2 hi guys,Steve A few day ago I post an item " mapserver 5.6 CGI output GeoJSON format " here<http://lists.osgeo.org/pipermail/mapserver-users/2012-April/072028.html> in which I asked a question about mapserver CGI output GeoJSON,finally with Steve's help I got it! URL1:http://192.168.207.100/cgi-bin/mapserv?map=/opt/fgs/www/htdocs/xj1/xj1.map&layer=tielu&mode=nquery&qformat=geojson. But now I want to add where-clause to prefilter,or I want set filter with CGI. The 'tielu' layer stored in postgis including these fields: gid,type,name,comment,the_geom, then I execute URL2:http://192.168.207.100/cgi-bin/mapserv?map=/opt/fgs/www/htdocs/xj1/xj1.map&layer=tielu&mode=nquery&qlayer=tielu&qitem=name&qstring=namexx&qformat=geojson but the output is as same as the URL1's output, in fact the qstring, qitem don't take affect. I searched and visited http://www.osgeo.org/pipermail/mapserver-users/2003-April/042003.html and http://lists.osgeo.org/pipermail/mapserver-users/2009-August/062581.html, which are all Steve's ansewer posts. so I modified tielu layer in the mapfile as Steve's suggestion, ... METADATA 'ows_title' 'tielu' "wfs_title" "tielu" .... "qstring_validation_pattern" '^[A-Z]{2,8}$' END ... then I execute http://192.168.207.100/cgi-bin/mapserv?map=/opt/fgs/www/htdocs/xj1/xj1.map&layer=tielu&mode=itemnquery&qlayer=tielu&qitem=name&qstring=namexx&qformat=geojson, and returns the error, mapserv(): Web application error. Parameter 'qstring' value fails to validate. msValidateParameter(): Regular expression error. Parameter pattern validation failed. msEvalRegex(): Regular expression error. String failed expression test. I have to search and search, but couldn't work out. any suggestion, thans very much.
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