I'm trying to replace all instances of an old BB tag markup in a MySql database with a newer, slightly different one.
The old format is this...
[youtube:********]{Video ID}[/youtube:********]
Which I would like to replace with this...
[youtube:********]http://www.youtube.com/watch?v={Video ID}[/youtube:********]
Where the *'s are a random string of alpha-numeric characters. So simply REPLACE(feild, '[youtube:********]', '[youtube:********]http://www.youtube.com?watch?v= won't do unfortunately.
All the clumsy attempts I've made using REPLACE() and INSTR() have resulted in nasty things like [b]Bold Text[/b]http://www.youtube.com/watch?v=
Is there a way to do this kind of pattern replacement in MySql? Possibly with Regular Expressions?
Thank you.
Is this what you tried?
UPDATE table SET Field = REPLACE(Field,']{',']http://www.youtube.com/watch?v={')
This would depend if there isnt any other occurences of ']{'
EDIT: You may also want to try:
UPDATE table SET Field = LEFT(Field,#) + 'http://www.youtube.com/watch?v='+
RIGHT(Field,(Char_Length(Field)-#);
Just check the syntax with MYSQl docs. Char_LNEGTH() may need to be LENGTH() - im sure you get the idea
Related
I have an JSON string stored in the database and I need to SQL COUNT based on the WHERE condition that is in the JSON string. I need it to work on the MYSQL 5.5.
The only solution that I found and could work is to use the REGEXP function in the SQL query.
Here is my JSON string stored in the custom_data column:
{"language_display":["1","2","3"],"quantity":1500,"meta_display:":["1","2","3"]}
https://regex101.com/r/G8gfzj/1
I now need to create a SQL sentence:
SELECT COUNT(..) WHERE custom_data REGEXP '[HELP_HERE]'
The condition that I look for is that the language_display has to be either 1, 2 or 3... or whatever value I will define when I create the SQL sentence.
So far I came here with the REGEX expression, but it does not work:
(?:\"language_display\":\[(?:"1")\])
Where 1 is replaced with the value that I look for. I could in general look also for "1" (with quotes), but it will also be found in the meta_display array, that will have different values.
I am not good with REGEX! Any suggestions?
I used the following regex to get matches on your test string
\"language_display\":\[(:?\"[0-9]\"\,)*?\"3\"(:?\,\"[0-9]\")*?\]
https://regex101.com/ is a free online regex tester, it seems to work great. Start small and work big.
Sorry it doesn't work for you. It must be failing on the non greedy '*?' perhaps try without the '?'
Have a look at how to serialize this data, with an eye to serializing the language display fields.
How to store a list in a column of a database table
Even if you were to get your idea working it will be slow as fvck. Better off to process through each row once and generate something more easily searched via sql. Even a field containing the comma separated list would be better.
Im trying to perform a regex match in mysql to match a string when part of the string is not present. i.e
src="/images/(?legacy)
if the string src="/images/ is present but the string legacy is not.
Any ideas ?
MySQL regexen do not support negative lookaheads, so I think your best bet would be to use two or to use LIKE
string LIKE '%src="/images/%'
AND string NOT LIKE '%src="/images/legacy%'
Note that this query would be inefficient (as it would be using regexen).
I know this is not what you're asking, but MySQL regexes do not support negative lookahead and AFAIK mysql regexes dont use the index.
So i think you may be over thinking it, as the regex would be shorter in writing (if it could work, which it cant) but traditional LIKE is faster.
I suggest you simply use:
WHERE (
content LIKE '%src="/images/%'
AND
content NOT LIKE '%src="/images/legacy%'
)
I have some text in a field that I need to replace, but the issue is it has a number ID appended to it, which I need to remove and replace with my value in my MySQL Trigger.
My field is like this:
[["Randomthinghere","anotherranodm4234","pitahayas","apples","bananas","apricots","grapes","kiwifruit"],["ACRE_PRC119_ID_9","randomthing","randomthing2"]]
And the value I need to replace ACRE_PRC119_ID_9 with is ACRE_PRC119, however its not always ID_9, it can be any reasonably small number value.
I've searched all over and read through manuals, and I'm honestly not sure what solution there is, if any in MySQL because I can't apply wildcard to replace.
If any solution requires REGEXP I could do something like REGEXP ^.*[[.".]]ACRE[[._.]]PRC119[[._.]]ID[[._.]]{[0-9]{1,9}}.*$'; sadly you can't capture the result.
Here you go
set #var:='[["Randomthinghere","anotherranodm4234","pitahayas","apples","bananas","apricots","grapes","kiwifruit"],["ACRE_PRC119_ID_9"]]';
select concat(substring(#var,1,locate('ID_',#var)-2),'"]]') ;
In field post_content I have a string like this in nearly 800 rows:
http://somesite.com/">This is some site</a>
I need to remove everything from "> onwards so that it leaves just the URL. I can't do a straight find and replace because the text is unique.
Any clues? This is really my first foray into MySQL database modifications but I did do an extensive search before posting here.
Thanks,
~Kyle~
From this site: http://www.regular-expressions.info/mysql.html
LIB_MYSQLUDF_PREG
If you want more regular expression power in your database, you can consider using LIB_MYSQLUDF_PREG. This is an open source library of MySQL user functions that imports the PCRE library. LIB_MYSQLUDF_PREG is delivered in source code form only. To use it, you'll need to be able to compile it and install it into your MySQL server. Installing this library does not change MySQL's built-in regex support in any way. It merely makes the following additional functions available:
Here it comes...
PREG_CAPTURE extracts a regex match from a string. PREG_POSITION returns the position at which a regular expression matches a string. PREG_REPLACE performs a search-and-replace on a string. PREG_RLIKE tests whether a regex matches a string.
Sounds exactly what you're looking for.
All these functions take a regular expression as their first parameter. This regular expression must be formatted like a Perl regular expression operator. E.g. to test if regex matches the subject case insensitively, you'd use the MySQL code PREG_RLIKE('/regex/i', subject). This is similar to PHP's preg functions, which also require the extra // delimiters for regular expressions inside the PHP string.
See this post: How to do a regular expression replace in MySQL?
Either that or you could just write a script in any lanugage which goes through each record, does a regex replacement and then updates the field. For more info on regex, see here: http://www.regular-expressions.info/reference.html
There's a number of options. One might be to use SUBSTRING_INDEX():
UPDATE
table
SET field = SUBSTRING_INDEX( field, '">', 1 )
It's possible - there is a syntax for User Defined Functions which would let you pass in a regular expression pattern that matches the link and strips everything else.
However, this is quite complicated for somebody new to MySQL, and from your question, this sounds like a one-off. In which case - why not just use Excel and then reimport the data?
Great stuff!
All seems doable with a little bit of time and self education.
In the end, I exported that table as a CSV in Sequel Pro and did some nifty find and replace work in Coda. Not as sophisticated as your suggestions, but it worked.
Thanks again,
~Kyle~
I have been having trouble searching through a MySQL table, trying to find entries with the character (UTF-16 code 200E) in a particular column.
This particular code doesn't have a glyph, so it doesn't seem to work when I try to paste it into my search term. Is there a way to specify characters as their respective code point instead for a query?
Thanks,
-Ben
Not tested, but CHAR() could work for this:
CHAR(0x200E);
I can't set up a full test case right now, let us know whether it worked.