Hi,
I am trying to understand the function substring.
Here:
select SUBSTRING(cit1.summary, '=([0-9]*)') from cms_items cit1
where cit1.summary ~* '.*linkadministration.*[0-9]*';
gives me two empty strings and
select SUBSTRING(cit1.summary, '=([0-9]{1,10})') from cms_items cit1
where cit1.summary ~* '.*linkadministration.*[0-9]*';
gives me the right values.
However, bizarrely,
select SUBSTRING(ban1.url_id, '=([0-9]*)')
from banner ban1
where ban1.url_id ~* '.*linkadministration.*[0-9]*';
select SUBSTRING(ban1.url_id, '=([0-9]{1,10})')
from banner ban1
where ban1.url_id ~* '.*linkadministration.*[0-9]*';
Both give me the same result!!! The difference being that in case two
the numbers I am catching are at the end of the strings and in case 1
in the middle. Is this normal? Which is correct?
Cheers
Anton
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TIP 6: explain analyze is your friend
