Need help with Charindex function..

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Need help with Charindex function..

Chinna

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Points: 5408
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September 30, 2013 at 1:18 am

#277596

I am trying to capture an email address from the below message..whats the best possible way to do it ..
DECLARE @test-2 VARCHAR(500)
SET @test-2 = '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
Its the Journey which gives you Happiness not the Destination-- Dan Millman

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John Mitchell-245523 SSC Guru Points: 148809 More actions · Answer 1

Chinna

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

John

ParulPrabu SSCrazy Points: 2271 More actions · Answer 2

Hi,

Use this script

DECLARE @test-2 VARCHAR(500)

SET @test-2 = '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 SSC Guru Points: 186127 More actions · Answer 3

-- 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;

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
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Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

Luis Cazares SSC Guru Points: 183706 More actions · Answer 4

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.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?

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Dwain Camps SSC Guru Points: 86948 More actions · Answer 5

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.

My mantra: No loops! No CURSORs! No RBAR! Hoo-uh![/I]
My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.

Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St

Chinna SSCertifiable Points: 5408 More actions · Answer 6

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 SSC Guru Points: 1004312 More actions · Answer 7

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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)