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Match null value in substitution or filter in DD

jkepler

I am having problems matching a null value for either a substitution or a filter element. I am trying to use a discard filter to ignore a DCR if it contains an EA that is null. Something like:
<filter name="DiscardFilter">
<discard>
<or>
<field name="db/dcrmap/htmlpath" match="^$" />
</or>
</discard>
</filter>

I have tried to match with 'match="^$"' and with 'match=""'. Neither work. I even tried to set up a substitution that replaced "^$" or "" with "DISCARD" and set up a discard filter to check for that, thinking that it might work as a substitution if it wasn't working as a filter.

What's going on? How do I match a null value in a DD config file. I've seen some suggestions on other threads, none of which seem to work. I've enclosed the dd config I am working with.

Any suggestions would be appreciated.
Thank you.

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OpenDeploy Version 6.0.2.0.0 Build 47215 Interwoven 20050413 w/ DD module

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Comments

Migrateduser

I haven't tried this but what about passing ^NULL$ to it?

jkepler

That would have been nice, eh? I tried "^NULL$", "^null$", and "null". No dice.

TroyP

I have had success doing this by making the value required. In my case it has to contain a word character. See red line below for an example.

[HTML]

[/HTML]

TroyP

To make a value null in my DB I use a substitution like this:

[HTML][/HTML]

...where I know that there will never be a match after public.