Not pretty, but how about creating 3 like statements. I have this in an old query that looks for the word file in member descriptions. There a space between all the percent signs and the characters next to them.
where upper(ODOBTX) like 'FILE %'
or upper(odobtx) like '% FILE %'
or upper(odobtx) like '% FILE'
-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of smith5646midrange@xxxxxxxxx
Sent: Tuesday, June 04, 2019 10:37 AM
To: 'RPG programming on IBM i'
Cc: 'David Gibbs'
Subject: RE: Need help with a regex pattern
I was using the SQL version and performance landed on its face.
Using this in my join of two tables...
left join source on Regexp_like(srcdta,
'[^A-Za-z0-9_@#$]'||trim(field)||'[^A-Za-z0-9_@#$]','i')
it runs for about 5 minutes.
Switching to this (which only finds ACCT and doesn't eliminate prefixed or suffixed values such as ACCT01)
left join source on srcdta like '%'||trim(field)||'%'
it runs in about 5 seconds.
These times are pretty consistent over multiple tests (alternating which is executed first) so it is not caching or CPU bog down or any of that.
So. I thought I would switch to use the later and then then add the RegEx to my RPG for the other part and see what that does.
-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of David Gibbs via RPG400-L
Sent: Tuesday, June 4, 2019 11:29 AM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Cc: David Gibbs <david@xxxxxxxxxxxx>
Subject: Re: Need help with a regex pattern
On Tue, Jun 4, 2019 at 10:23 AM <smith5646midrange@xxxxxxxxx> wrote:
Is there a way to build an expression so I can provide a variable
value at run time rather than freeing and recompiling the pattern
every time the variable changes?
Are you using the regex api's directly?
If so, I suggest you take a look at the SQL regexp_* functions.
https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_72/db2/rbafzscaregexp_
substr.htm
They are much easier to work with IMO.
david
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