Removing non-alphaNumerics in MySQL

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Do you know any easy way to remove (or replace) all non alphanumeric characters from varchar variable in Mysql?

something like String's replaceAll("[^a-zA-Z0-9]", "I") in Java ('I' is my special character but "" would be also good )

It appears that MySQL doesn't provide this functionality (unlike PostgreSQL), according to the docs of RegexBuddy:

MySQL's support for regular expressions is rather limited, but still very useful. MySQL only has one operator that allows you to work with regular expressions. This is the REGEXP operator, which works just like the LIKE operator, except that instead of using the _ and % wildcards, it uses a POSIX Extended Regular Expression (ERE).

How to remove all non-alphanumeric characters from a string in , There is no inbuilt function to remove non-alphanumeric characters from a string in MySQL. Therefore, we create a function which removes all non-alphanumeric characters. The function declaration and definition is as follows. I'm looking for a function or something to remove non-alphanumeric characters from fields in a table. I need to run a comparison between fields in 2 tables, but the data in the fields often contains non-alphanumeric characters.

I am going to use somethin like this for each string (I replace each bad char with 'O'):

CREATE FUNCTION removeNonAlphaNum (p_zthes VARCHAR(255)) RETURNS VARCHAR(255)
BEGIN
DECLARE v_i INTEGER;
DECLARE v_char VARCHAR(1);
DECLARE v_res VARCHAR(255);
SET v_i := LENGTH(p_zthes);
SET v_res:=p_zthes;
WHILE v_i > 0 DO
    SET v_char := SUBSTRING(p_zthes, v_i, 1);
    IF (SELECT v_char REGEXP '[^a-zA-Z0-9]') THEN
      SET v_res := REPLACE(v_res, v_char, 'O');
    END IF;
    SET v_i := v_i - 1;
  END WHILE;
return v_res;
END 

but I thought I could avoid such monster (iterating over chars in string and checking each against regex... bleeeeee...) :-/ I still need to test it.

Aren't there any more sexy solutions?

How to remove special characters from a database field in MySQL?, How do I remove special characters from a mysql query? data sample: Basically I mainly need to remove the full stops and hyphens as I will require to compare it to another file but the naming isn't very consistent so i had to remove the non-alphanumeric for much more accurate result. creative-3 smart tech pte. ltd. nutritive asia asia's first desired result:

this is the solution in sql server. But the concept goes like I have created a number table and splitted the charecters and then matching those against the regular expression.

Hope the same concept can be portrayed in mysql with a bit change and that hopefully u can do.

    declare @str varchar(50)
    set @str = '1ab3^45)(*%'

    declare @NumberTable table(id int)
    insert into @NumberTable(id) values(1)
    insert into @NumberTable(id) values(2)
    insert into @NumberTable(id) values(3)
    insert into @NumberTable(id) values(4)
    insert into @NumberTable(id) values(5)
    insert into @NumberTable(id) values(6)
    insert into @NumberTable(id) values(7)
    insert into @NumberTable(id) values(8)
    insert into @NumberTable(id) values(9)
    insert into @NumberTable(id) values(10)
    insert into @NumberTable(id) values(11)
    insert into @NumberTable(id) values(12)

    select NonAlphaChars = SUBSTRING(@str,id,1) from @NumberTable
    where SUBSTRING(@str,id,1) like '%[^a-z0-9]'

NonAlphaChars

^
)
(
*
%

How to remove non-alphanumeric characters in Excel?, are double quotes (“ “), Number sign (#), dollar sign($), percent (%) etc. Since MySQL 8.0 you can use regular expression to remove non alphanumeric characters from a variable. There is method REGEXP_REPLACE. SELECT REGEXP_REPLACE(@variable, '[^0-9a-zA-Z ]', '') or . SET @variable = REGEXP_REPLACE(@variable, '[^0-9a-zA-Z ]', '')

For MSSQL I have committed something like this:

CREATE FUNCTION removeNonAlphaNum(@p_zthes VARCHAR(255)) 
RETURNS varchar(255) 
AS
BEGIN
DECLARE @v_bad_char_index INT;
DECLARE @v_bad_char VARCHAR(1);
DECLARE @v_res VARCHAR(255);
SET @v_res = @p_zthes;
SET @v_bad_char_index = patindex('%[^a-zA-Z0-9]%', @p_zthes) 
WHILE (@v_bad_char_index > 0)
  BEGIN
    SET @v_bad_char = SUBSTRING(@p_zthes, @v_bad_char_index, 1);
    SET @v_res = REPLACE(@v_res, @v_bad_char, 'O');
    SET @v_bad_char_index = patindex('%[^a-zA-Z0-9]%', @v_res ) 
  END
return @v_res;
END 

(but I am poor SQL programmer, so there probably exist some nicer solutions)

Remove non alphabetic characters from string in sql, How do I remove numeric and alphabetic characters in Excel? This code removes non-alpha characters (so numbers are also removed). If you want to leave the numbers (remove non-alpha numeric characters), then replace ^a-z with ^a-z^0-9 That search string appears in the code in two different places. Be sure to replace both of them. – George Mastros Jun 17 '09 at 18:51

Since MySQL 8.0 you can use regular expression to remove non alphanumeric characters from a variable. There is method REGEXP_REPLACE

SELECT REGEXP_REPLACE(@variable, '[^0-9a-zA-Z ]', '')

or

SET @variable = REGEXP_REPLACE(@variable, '[^0-9a-zA-Z ]', '')

Remove non-alphanumeric characters, How do I strip all non alphabetic characters from a string in SQL Server? Uninstall MySQL from Control Panel. To do so, Go to Control Panel >Programs and Features > Select MySQL > Click on Uninstall. After you have uninstalled MySQL through Add/Remove programs, you now need to remove the existing database information which includes your actual data. If you need any of that data, be sure to back it up.

mysql: Remove all non-alpha characters?, Hi all, I'm looking for a function or something to remove non-alphanumeric characters from fields in a table. I need to run a comparison between  Example MySQL TRIM() function removing from both side The following MySQL statement returns the string after removing the leading and trailing string 'leadtrail' from the given string 'leadtrailtextleadtrail'.

Removing non-alphaNumerics in MySQL, looking to remove all non-alphanumeric characters from a column: UPDATE mytable SET mycolumn = REMOVE_NON_ALPHAS(mycolumn)  Try this, It will fully wipeout out every single file of MySQL from your system: sudo service mysql stop #or mysqld sudo killall -9 mysql sudo killall -9 mysqld sudo apt-get remove --purge mysql-server mysql-client mysql-common sudo apt-get autoremove sudo apt-get autoclean sudo deluser -f mysql sudo rm -rf /var/lib/mysql sudo apt-get purge mysql-server-core-5.7 sudo apt-get purge mysql-client

mysql How to remove all non alpha numeric characters from a string , Do you know any easy way to remove (or replace) all non alphanumeric characters from varchar variable in Mysql? something like String's 

Comments
  • replace \W with "" before passing the string to mysql
  • those strings are already in db :( ...and there are zillions of them...
  • hmm is it somehow better (faster) then iterating over a string?