I find phone numbers to be the messiest data that users enter. There are so many variations with brackets that I wrote this UDF to help clean up the data.
Usage:
SELECT
Firstname
, SURNAME
, udfStripBracket(PHONENUMBER) AS BracketlessNumber
FROM dbo.UserContact
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS OFF
GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[udfStripBracket]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[udfStripBracket]
GO
CREATE FUNCTION udfStripBracket (@str varchar(255))
RETURNS nvarchar(255)
AS
BEGIN
Declare @udfStripBracket nvarchar(255)
SELECT @udfStripBracket = Convert(nvarchar(255),REPLACE((SELECT REPLACE(@str,'(','')),')',''))
RETURN(@udfStripBracket)
END
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO 
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