regex - Redshift regular expression for domain extraction -

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i'm trying form regular expression regexp_substr (redshift) extract sub-domain & domain part given url.

i tried many suggestions stackoverflow: regular-expression-extract-subdomain-domain, getting-parts-of-a-url-regex, how-to-get-domain-name-from-url , etc. of them work on regex validator don’t work on redshift.

a regular expression should handle urls , without http/https prefix.

is there other way of extracting sub-domain & domain given url using regular expression?

after ton of experimentation, use: 

replace(regexp_substr(url,'//[^/\\\,=@\\+]+\\.[^/:;,\\\\\(\\)]+'),'//','')

need match double slash , remove replace because of quite basic regex supported redshift.

fwiw, you'll notice very different regex provided jeff barr in redshift udf's intro - regex produces nothing me.


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