Strip characters from a String

How can I strip from below parameter, all characters starting with _ and ending with the character just before the comma or end of parameter string.

BEFORE:
joe_123,billy_7,house_12853,samsung_12345,a_1kirr

AFTER:
joe,billy,house,samsung,a
thayduckProgrammer AnalystAsked:
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Najam UddinCommented:
var input = "joe_123,billy_7,house_12853,samsung_12345,a_1kirr"
var temp = String.Join(",", input .Split(',').Select(x => x.Split('_')[0]));

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thayduckProgrammer AnalystAuthor Commented:
Getting errors.


This works:
set @input = 'joe_123,billy_7,house_12853,samsung_12345,a_1kirr'

This does not:
set @input1 = String.Join(",", @input .Split(',').Select(x => x.Split('_')[0]));   (see attachment)
Najam1.PNG
Najam UddinCommented:
Sorry, I gave it for C#, overlooked sql tag, Will update soon
grendel777Commented:
@Najam is using c#, but it sounds like you need TSQL. Several ways, but this works:
DECLARE @str VARCHAR(255) = 'joe_123,billy_7,house_12853,samsung_12345,a_1kirr'

WHILE (CHARINDEX('_', @str)  > 0)
BEGIN
	SET @str = LEFT(@str, CHARINDEX('_', @str)-1) + CASE WHEN CHARINDEX(',', @str) = 0 THEN '' ELSE '||' +  SUBSTRING(@str, CHARINDEX(',', @str)+1, LEN(@str)) END
END

SET @str = REPLACE(@str, '||', ',')
SELECT @str

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You could put that into a function and then use
SELECT fnc_GetCleanedString(@str)

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thayduckProgrammer AnalystAuthor Commented:
Worked perfectly.

Thanks for the help.....
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Microsoft SQL Server 2008

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