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

[Lime, Steve D (DNR)]

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
> 
> 
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