postgres function

On Wed, Oct 14, 2015 at 9:38 AM, Ramesh T <rameshparnanditech@gmail.com>
wrote:

Hi All,
Do we have function like regexp_substr in postgres..?

in oracle this function seach the - from 1 to 2 and return result,
regexp_substr(PART_CATG_DESC,'[^-]+', 1, 2)

​Maybe one of the functions on this page will get you what you need.

http://www.postgresql.org/docs/devel/static/functions-string.html

David J.

​

select position('-' in '123-987-123')
position
---
4
But I want second occurrence,
position
-------------
8

plz any help..?

On Thu, Oct 15, 2015 at 12:54 AM, David G. Johnston <
david.g.johnston@gmail.com> wrote:

On Thu, Oct 15, 2015 at 8:32 AM, Ramesh T <rameshparnanditech@gmail.com>
wrote:

select position('-' in '123-987-123')
position
---
4
But I want second occurrence,
position
-------------
8

plz any help..?

​
SELECT length((regexp_matches('123-987-123', '(\d{3}-\d{3}-)\d{3}'))[1])
​

David J.

'123-987-123' it is not fixed some times it may be '1233-9873-123-098'
as you said it's fixed,

changes the values in middle of the -

sometimes times i need 1233 and 098 or 9873,first position i'll find
direct for second variable we don't know where it's end with -

i.e ,
i need to find second postition of the variable between the '-'

On Thu, Oct 15, 2015 at 6:32 PM, David G. Johnston <
david.g.johnston@gmail.com> wrote:

On 10/15/2015 07:05 AM, Ramesh T wrote:

'123-987-123' it is not fixed some times it may be '1233-9873-123-098'
as you said it's fixed,

changes the values in middle of the -

sometimes times i need 1233 and 098 or 9873,first position i'll find
direct for second variable we don't know where it's end with -

i.e ,
i need to find second postition of the variable between the '-'

Are you looking for the position or the actual variable? If you really
want the latter you can do:

select split_part('123-987-123','-',2);
select split_part('1233-9873-123-098','-',2);

Joe

--
Crunchy Data - http://crunchydata.com
PostgreSQL Support for Secure Enterprises
Consulting, Training, & Open Source Development

Well you could use

SELECT LENGTH(REGEXP_REPLACE('123-987-123', '(([^-]*-){2}).*', '\1'));

Not pretty, but it works.

Geoff

On 15 October 2015 at 15:05, Ramesh T <rameshparnanditech@gmail.com> wrote:

On Thu, Oct 15, 2015 at 10:05 AM, Ramesh T <rameshparnanditech@gmail.com>
wrote:

'123-987-123' it is not fixed some times it may be '1233-9873-123-098'
as you said it's fixed,

changes the values in middle of the -

sometimes times i need 1233 and 098 or 9873,first position i'll find
direct for second variable we don't know where it's end with -

i.e ,
i need to find second postition of the variable between the '-'
​​

​While I and others are likely inclined to provide you a working solution
to do so you need to state your data and requirement more clearly.​ Given
the apparent language dynamic I'd suggest supplying 5-10 example data
values along with their expected result.

​Otherwise, regular expressions almost certainly will let you solve your
problem (though, like Joe Conway indicated, split_​part may be possible)
once you learn how to construct them. regexp_matches(...) is the access
point to using them.

David J.

yes David gave correct solution

but , the value I'm using and it's column in the table sometimes value
may be '123-987-123' or '123-987-123-13-87'

if pass like below must return else condiion 0,

select case when select split_part('123-987-123','-',4) >0
then 1 else 0 end
it's return error like integer need...

On Thu, Oct 15, 2015 at 8:50 PM, David G. Johnston <
david.g.johnston@gmail.com> wrote:

On Thu, Oct 15, 2015 at 3:15 PM, Ramesh T <rameshparnanditech@gmail.com>
wrote:

yes David gave correct solution

but , the value I'm using and it's column in the table sometimes value
may be '123-987-123' or '123-987-123-13-87'

​So adapt the answer provided to match your data.​

if pass like below must return else condiion 0,

select case when select split_part('123-987-123','-',4) >0
then 1 else 0 end
it's return error like integer need...

​I have no clue what you are trying to say here...

David J.
​

On 15/10/15 14:32, Ramesh T wrote:

select position('-' in '123-987-123')
position
---
4
But I want second occurrence,
position
-------------
8

plz any help..?

For instance:

# select char_length(substring('123-987-123' from '^[^-]*-[^-]*-'));
char_length
-------------
8

Best,
Torsten

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On 10/14/15 8:38 AM, Ramesh T wrote:

Hi All,
Do we have function like regexp_substr in postgres..?

in oracle this function seach the - from 1 to 2 and return result,
regexp_substr(PART_CATG_DESC,'[^-]+', 1, 2)

Use regexp_split_to_array(string text, pattern text [, flags text ]):

SELECT regexp_split_to_array('1-2-3-4-5', '-');
regexp_split_to_array
-----------------------
{1,2,3,4,5}

If you just want one part of the array:

SELECT (regexp_split_to_array('1-2-3-4-5', '-'))[2];
regexp_split_to_array
-----------------------
2

(Note the extra ()s)

If that's not what you need then as David suggested please provide a few
input values and what you expect as your *final* output. IE: tell us
what you're ultimately trying to do, instead of just asking about regexp
matching. There may be a much better way to do it in Postgres than
whatever you were doing in Oracle.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com

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