I recall not long ago a discussion about regular expressions in a query that hit on this exact topic but don't think it was ever resolved so I am giving it a go again...
Here is my query (keep in mind that I am just experimenting now so don't worry about the fact that I am using nested substring function calls):
SELECT
referrer,
substring(referrer FROM '^([^\\/]*\\/\\/[^\\/]*)(\\/)?'),
substring(referrer FROM '^[^\\/]*\\/\\/www\\.google\\.[^\\/]*\\/[^\\?]*\\?(.*)$'),
substring(substring(referrer FROM '^[^\\/]*\\/\\/www\\.google\\.[^\\/]*\\/[^\\?]*\\?(.*)$') FROM '((%&q=)|(q=))#"[^&]*#"((&%)|())' FOR '#')
FROM one_hour_air.web_page_view
WHERE referrer ~ '^[^\\/]*\\/\\/(www.google\\.[^\\/]*)\\/'
What I get is:
What I expected for substring_2 was (respectively):
one+hour+heating
One+hour+heating+and+Air
I thought by using the FOR '#' I could specify exactly what part of the expression I would get but it still grabs the first (...) of the pattern. At least that is what the documentation in seciton 9.7.2 at
http://www.postgresql.org/docs/8.1/static/functions-matching.html led me to believe. How can I get the part of the string I am really after without using one nested substring after another?
Thanks,
Aaron Bono
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Aaron Bono
Aranya Software Technologies, Inc.
http://www.aranya.com ==================================================================
