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Starting Member

3 Posts

Posted - 10/20/2005 :  11:05:21  Show Profile  Reply with Quote
I need to strip out all non letter/number characters from a series of strings in a query. Is there a better way to do this than a bunch of replace functions?

Flowing Fount of Yak Knowledge

2878 Posts

Posted - 10/20/2005 :  12:57:40  Show Profile  Visit Seventhnight's Homepage  Reply with Quote

Removes any characters from 
@myString that do not meet the 
provided criteria.
CREATE FUNCTION dbo.GetCharacters(@myString varchar(500), @validChars varchar(100))
RETURNS varchar(500) AS
	While @myString like '%[^' + @validChars + ']%'
		Select @myString = replace(@myString,substring(@myString,patindex('%[^' + @validChars + ']%',@myString),1),'')

	Return @myString

Declare @testStr varchar(1000),
	@i int

Set @i = 1
while @i < 255
		@TestStr = isnull(@TestStr,'') + isnull(char(@i),''), 
		@i = @i + 1

Select @TestStr
Select dbo.GetCharacters(@TestStr,'a-z')
Select dbo.GetCharacters(@TestStr,'0-9')
Select dbo.GetCharacters(@TestStr,'0-9a-z')
Select dbo.GetCharacters(@TestStr,'02468bferlki')


Co-worker on children "...when I have children, I'm going to beat them. Not because their bad, but becuase I think it would be fun ..."

Edited by - Seventhnight on 10/20/2005 12:58:02
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Yak Posting Veteran

52 Posts

Posted - 11/07/2012 :  12:36:53  Show Profile  Reply with Quote
Thank you for your reaction.
Though i've used the following query:

While @myString like '%[^' + @validChars + ']%'
		Select @myString = replace(@myString,substring(@myString,patindex('%[^' + @validChars + ']%',@myString),1),'')

	Return @myString

Thanks to Seventhnight
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