SQL - Remove Special Characters

Removes all special characters from an input string.

USE MIGRATION_DB  
SET ANSI_NULLS ON  
GO  
SET QUOTED_IDENTIFIER ON  
GO  
IF OBJECT_ID (N'dbo.RemoveSpecialChars', N'FN') IS NOT NULL  
    DROP FUNCTION dbo.RemoveSpecialChars;  
GO  
CREATE FUNCTION dbo.RemoveSpecialChars   
( @InputString VARCHAR(max)   
)  
RETURNS VARCHAR(8000)  BEGIN      
IF @InputString IS NULL RETURN NULL      
  
DECLARE @OutputString VARCHAR(max)      
SET @OutputString = ''      
DECLARE @l INT      
SET @l = LEN(@InputString)      
DECLARE @p INT      
SET @p = 1  
    WHILE @p <= @l  
        BEGIN              
        DECLARE @c INT              
        SET @c = ASCII(SUBSTRING(@InputString, @p, 1))              
        IF @c BETWEEN 48 AND 57  
                OR @c BETWEEN 65 AND 90  
                OR @c BETWEEN 97 AND 122  
                  --OR @c = 32                  
                  SET @OutputString = @OutputString + CHAR(@c)              
                  SET @p = @p + 1  
        END    IF LEN(@OutputString) = 0  RETURN NULL      
RETURN @OutputString  
END  
GO

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