SQL 中使用正则表达式过滤字母或数字

 

-- \'%[^a-z]%\'

CREATE Function [dbo].[RemoveNonAlphaCharacters](@Temp VarChar(1000))
Returns VarChar(1000)
AS
Begin
 
    While PatIndex(\'%[^a-z]%\', @Temp) > 0
        Set @Temp = Stuff(@Temp, PatIndex(\'%[^a-z]%\', @Temp),  1, \'\')
 
    Return @TEmp
End

-- \'%[^a-z0-9]%\'

CREATE Function [dbo].[RemoveNonAlphaNumericCharacters](@Temp VarChar(1000))
Returns VarChar(1000)
AS
Begin
 
    While PatIndex(\'%[^a-z0-9]%\', @Temp) > 0
        Set @Temp = Stuff(@Temp, PatIndex(\'%[^a-z0-9]%\', @Temp), 1, \'\')
 
    Return @Temp
End

-- \'%[^0-9]%\'

CREATE Function [dbo].[RemoveNonNumericCharacters](@Temp VarChar(1000))
Returns VarChar(1000)
AS
Begin
 
    While PatIndex(\'%[^0-9]%\', @Temp) > 0
        Set @Temp = Stuff(@Temp, PatIndex(\'%[^0-9]%\', @Temp), 1, \'\')
 
    Return @TEmp
End