Extract multiple substrings between 2 characters from 8000 characters text .

Question

Hi Jonathan,
I have a text column which has text and email addresses to which email was sent, i want to collect the list of domains in the text.
Ex: ' email sent to abcdotcom; email sending failed; email sent to xxxdotcom; email sent to yyydotcom; email failed'
I want to extract  list if domains listed in the text, i am trying to extract multiple sub string values in between @ and . characters.
Thanks in advance!

Answer 1

You can use SPLIT function in order to split the string into several values (In the case of using table function you get several rows return)
Here you can find a great CLR split function that you can use:
http://sqlblog.com/blogs/adam_machanic/archive/2009/04/28/sqlclr-string-splitting-part-2-even-faster-even-more-scalable.aspx
Here you can see why you have to use CLR and not T-SQL function:
http://sqlperformance.com/2012/07/t-sql-queries/split-strings
For the
part of cleaning the string I will recommend to use regular expression which you can combine in the SPLIT function as on function (best solution) or use before.
check this link: http://msdn.microsoft.com/en-us/magazine/cc163473.aspx
** I your case you can just use Regular Expressions directly and finct what you need without split (I think.. we just need to think about the right Expressions)
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