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Need help with Charindex function..


Need help with Charindex function..

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Sri8143
Sri8143
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I am trying to capture an email address from the below message..whats the best possible way to do it ..


DECLARE @test VARCHAR(500)
SET @test = 'my email is Test@email.com.au how do i capture just the email'



This is what I have tried but couldn't get to finish it where I can capture the whole email address
SELECT SUBSTRING(@test,CHARINDEX('@',@test),CHARINDEX(' ',@test,CHARINDEX('@',@test))-CHARINDEX('@',@test))

Thanks in Advance

Thanks,
Chinna

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John Mitchell-245523
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Chinna

You need to REVERSE the string and then look for the first space after the "@".

John
parulprabu
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Hi,

Use this script


DECLARE @test VARCHAR(500)
SET @test = 'my email is Test@email.com.au how do i capture just the email'

SELECT REVERSE(SUBSTRING(REVERSE(@test),CHARINDEX('@',REVERSE(@test))+1,CHARINDEX(' ',REVERSE(@test),CHARINDEX('@',REVERSE(@test)))-CHARINDEX('@',REVERSE(@test))))
+SUBSTRING(@test,CHARINDEX('@',@test),CHARINDEX(' ',@test,CHARINDEX('@',@test))-CHARINDEX('@',@test))



ChrisM@Work
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-- solution
;WITH SampleData AS (
SELECT test = 'my email is Test@email.com.au how do i capture just the email' UNION ALL
SELECT 'No email address in this string'
)
SELECT test, x3.p3
FROM SampleData
CROSS APPLY (SELECT p1 = NULLIF(CHARINDEX('@',test,1),0)) x1
CROSS APPLY (SELECT p2 = SUBSTRING(test,(2+p1-CHARINDEX(' ',REVERSE(LEFT(test, x1.p1)))),8000)) x2
CROSS APPLY (SELECT p3 = LEFT(p2,CHARINDEX(' ',p2,1)-1)) x3;

-- workings
;WITH SampleData AS (
SELECT test = 'my email is Test@email.com.au how do i capture just the email' UNION ALL
SELECT 'No email address in this string'
)
SELECT *
FROM SampleData
CROSS APPLY (SELECT p1 = NULLIF(CHARINDEX('@',test,1),0)) x1
CROSS APPLY (SELECT p2 = LEFT(test, x1.p1)) x2
CROSS APPLY (SELECT p3 = REVERSE(p2)) x3
CROSS APPLY (SELECT p4 = CHARINDEX(' ',p3)) x4
CROSS APPLY (SELECT p5 = 2+p1-p4) x5
CROSS APPLY (SELECT p6 = SUBSTRING(test,p5,8000)) x6
CROSS APPLY (SELECT p7 = LEFT(p6,CHARINDEX(' ',p6,1)-1)) x7;



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Luis Cazares
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Just another possible solution.
SELECT *
FROM DelimitedSplit8K(@test, ' ') x
WHERE CHARINDEX( '@', x.Item) > 0



For the code of DelimitedSplit8K please read the following article:
http://www.sqlservercentral.com/articles/Tally+Table/72993/


Luis C.
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To add onto Luis's suggestion:


WITH SampleData AS (
SELECT test = 'my email is Test@email.com.au how do i capture just the email' UNION ALL
SELECT 'Some invalid@email addresses can also be removed like this' UNION ALL
SELECT 'Some invalid @email addresses can also be removed like this' UNION ALL
SELECT 'Some invalid email@. addresses can also be removed like this' UNION ALL
SELECT 'Some invalid email@@address.can can also be removed like this' UNION ALL
SELECT 'No email address in this string'
)
SELECT test, item
FROM SampleData a
CROSS APPLY dbo.DelimitedSplit8K(test, ' ') b
WHERE CHARINDEX('@', item) < CHARINDEX('.', item) AND CHARINDEX('@', item) > 1 AND
CHARINDEX('.', item) < LEN(item) AND LEN(item) - 1 = LEN(REPLACE(item, '@', ''));




Etc.


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Sri8143
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Thanks a lot guys...All of the responses were helpful .

Thanks,
Chinna

Its the Journey which gives you Happiness not the Destination-- Dan Millman
Jeff Moden
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Luis Cazares (9/30/2013)
Just another possible solution.
SELECT *
FROM DelimitedSplit8K(@test, ' ') x
WHERE CHARINDEX( '@', x.Item) > 0



For the code of DelimitedSplit8K please read the following article:
http://www.sqlservercentral.com/articles/Tally+Table/72993/


:-)

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
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