SELECT regex_replace(‘+’, ‘bar’, ‘foo1 foo2 foo3’) Here are some more complex regexes, that illustrate the issue hopefully a little more clearly: SELECT regex_replace(‘/foo/’, ‘bar’, ‘foo1 foo2 foo3’) Just to show that the ‘/’ required by php is not relevant here: In PHP, which has regex replacements built in, it comes out correctly:Įcho preg_replace(‘/foo/’, ‘bar’, ‘foo1 foo2 foo3’) SELECT regex_replace(‘foo’, ‘bar’, ‘foo1 foo2 foo3’)
The simplest regex, which should work, will not: In these examples, the goal is to replace the “foo”s in “foo1 foo2 foo3” with “bar”s, to get “bar1 bar2 bar3”. Here are some examples to explain the problem. Those two lines extract a single character, test that single character, and replace only that one character.Īs I understand it, (ans as my testing below shows) it is impossible, using this, to replace a string of more than one character. It replaces all instances of single letters that match a regular expression, which is a very different thing. _,') ĭespite your protestations, this function in its current form does not, replace a regular expression. Mysql> select regex_replace('','','2my test3_text-to.
MYSQL REGEX REPLACE HOW TO
If you are using MySQL version 5.0.1 or higher, make sure you set the NO_BACKSLASH_ESCAPES mode ON, before you use the above function to replace any characters which are escaped with back slash “\”, ie: \A,\B,etc… See how to set the NO_BACKSLASH_ESCAPES mode here IF NOT ch REGEXP pattern THEN SET temp = CONCAT(temp,ch) ĮLSE SET temp = CONCAT(temp,replacement) Loop_label: LOOP IF i>CHAR_LENGTH(original) THEN LEAVE loop_label
MYSQL REGEX REPLACE CODE
I gave up searching finally and wrote my own “regex_replace” MySQL function.īelow is the source code of my function DELIMITER $$ĬREATE FUNCTION `regex_replace`(pattern VARCHAR(1000),replacement VARCHAR(1000),original VARCHAR(1000))ĭETERMINISTIC BEGIN DECLARE temp VARCHAR(1000)
MYSQL REGEX REPLACE INSTALL
There was one called UDB but that’s also you need to install a module and stuff like that. Anyone know if this is possible and if so, what the correct syntax would be? Thanks.Recently I came across a requirement where I had to cleanse the data that I’m inserting in to MySQL database using regular expressions, so I started searching for a function to do this on MySQL, but unfortunately I couldn’t find any. I'm definitely no DBA and this is a bit over my head. I tried to structure the query like this and just get errors.
SET DESCRIPTION = REGEXP_REPLACE('(^IC | IC$| IC )','INTEGRATED CIRCUIT ',' INTEGRATED CIRCUIT',' INTEGRATED CIRCUIT ')īut results in ERROR CODE 1292 TRUNCATED INCORRECT INTEGER VALUE: ' INTEGRATED CIRCUIT'Ĭlosest answer to the issue that I've found was this post referring to the same issue in Oracle 10G. SET description = REGEXP_REPLACE(description,'(^IC | IC$| IC )',INTEGRATED CIRCUIT)īut this doesn't work well in my case because it creates "THISINTEGRATED CIRCUIT" in some cases I've found I can use a REGEX group to change all strings in the group to one item I have hundreds of different combinations of strings that I need to change to other specific strings and I'd love to combine all these instead of creating 100's of different commands Results in field containing "THIS IC" changed to "THIS INTEGRATED CIRCUIT" which are both perfect. SET description = REGEXP_REPLACE(description, ' IC$', ' INTEGRATED CIRCUIT ') Results in field only containing "IC" changed to "INTEGRATED CIRCUIT"
SET description = REGEXP_REPLACE(description, '^IC$', 'INTEGRATED CIRCUIT') I'm using the regexp_replace function in mySQL 8.0 with good success. I have a large database that I'm cleaning up and am writing stored procedures to normalize the garbage that is entered daily. I've been dealing with an issue over a couple days.
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