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[LDM #KDR-961244]: 20201007: Query on pqact and best practices for regex
- Subject: [LDM #KDR-961244]: 20201007: Query on pqact and best practices for regex
- Date: Wed, 07 Oct 2020 18:19:58 -0600
Hi Gregg,
The regex(1) utility (part of the LDM package) can help you determine which
regular expression is more efficient if you execute it under the time(1)
utility. regex(1) has a man(1) page. See
<https://www.unidata.ucar.edu/software/ldm/ldm-current/basics/ERE.html> for a
related example.
> I looked through the LDM support archives and didn't find an answer to
> this query. So I appreciate your time.
>
> In LDM I would like to know what provides more efficiency, or what is
> the best practice in terms of CPU efficiency when one is creating a new
> regex pattern.
>
> For example, outside of the output path being different, in the
> following two pqact.conf entries, is one preferable over the other in
> LDM in terms of CPU cycles, regex processing, etc.?
>
> #. /nfsdata/realtime/outgoing/spcnids/CONUS/EchoTop_18_20201007-161834.gz
>
> EXP
> ^.........................................EchoTop_18_..(......).(....).*
>
> PIPE -close w2gunzip.sh
> /NAWIPS/nadata2/images/satellite/RADAR_NATL/MRMS-ECHO18/ECHO18_\1_\2
>
>
>
> EXP
> EchoTop_18_([0-9][0-9][0-9][0-9][0-1][0-9][0-3][0-9])-([0-2][0-9][0-5][0-9])([0-5][0-9]).gz
> PIPE -close w2gunzip.sh
> /data/radar/mrms/nat/tops-18/\1_\2.tops-18_nat
Regards,
Steve Emmerson
Ticket Details
===================
Ticket ID: KDR-961244
Department: Support LDM
Priority: Normal
Status: Closed
===================
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