[mapserver-users] RE: CLASS EXPRESSION regex help?

[Jeff McKenna]

Are all of these tricks discussed here documented somewhere?

-jeff



-- 
Jeff McKenna
MapServer Consulting and Training Services
http://www.gatewaygeomatics.com/




Lime, Steve D (DNR) wrote:
> If all of your classes have expressions then there is no default and some features will not be drawn. You kinda get the best of both worlds with this approach...
> 
> Steve
> 
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Johan Forsman
> Sent: Friday, July 23, 2010 10:39 AM
> To: mapserver-users at lists.osgeo.org
> Subject: [mapserver-users] RE: CLASS EXPRESSION regex help?
> 
> Thanks Steve, that appears to work!
> 
> I did not realize MapServer would on its own accord exclude the already CLASSified records from the second CLASS unless I explicitly instructed it what to exclude. I presumed it would just draw them again together with the rest. Nice!
> 
> Thanks!
> 
> Now back to monitoring the brewing storm in the Gulf.
> 
>> -----Original Message-----
>> From: Lime, Steve D (DNR) [mailto:Steve.Lime at state.mn.us]
>> Sent: Friday, July 23, 2010 10:01 AM
>> To: Johan Forsman; mapserver-users at lists.osgeo.org
>> Subject: RE: CLASS EXPRESSION regex help?
>>
>> Hi Johan: Are you looking for just two classes, one for records that start
>> with "LADE" and another for everything else? If so you can just omit the
>> expression from the second class and it will function as a default class
>> so everything that doesn't match the first will be assigned the second.
>> It's faster to execute than trying to expressly define a second regex.
>> Doesn't solve the regex error but then again you may not need to.
>>
>> Steve
>>
>> -----Original Message-----
>> From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-
>> bounces at lists.osgeo.org] On Behalf Of Johan Forsman
>> Sent: Friday, July 23, 2010 9:20 AM
>> To: mapserver-users at lists.osgeo.org
>> Subject: [mapserver-users] CLASS EXPRESSION regex help?
>>
>> All:
>>
>> Regex neophyte, using MS 5.4.2 in FGS on Ubuntu Server 9.10, I wish to
>> render two classes based on content in a PostGIS field.
>>
>> For the first CLASS I want all records that start with "LADE", and using
>>
>> NAME "LADE"
>> EXPRESSION /^LADE.*/
>>
>> appears to return the expected records.
>>
>> However, for the second CLASS I want all records that DO NOT start with
>> "LADE", but using
>>
>> NAME "Other"
>> EXPRESSION /^(?!LADE).*/
>>
>> does not return any records and the log contains
>>
>> msEvalExpression() error: Regular expression error. Invalid regular
>> expression.
>>
>> Examples out in the ether all indicate that this "negative lookahead" is
>> supposed to do exactly what I want.
>>
>> What am I doing wrong in this instance?
>>
>> Thanks!
>> /Johan.
>>
>> ----------------------
>> Johan Forsman
>> Geologist
>> Safe Drinking Water Program
>> Louisiana Department of Health and Hospitals
>> Office of Public Health
>> Telephone: 225.342.7309
>> Telefax: 225.342.7303
>>
>>