MySQL Regex 搜索和替换 [英] MySQL Regex Search and replace

问题描述

我想从我的数据库中的所有图像中删除高度属性.它们的标记如下:

I would like to remove height property from all my images in my database. Their markup is as follows:

<img src="path/img.jpg" width="x" height="y" />

我打算做这样的事情:

UPDATE jos_content SET introtext = REPLACE(introtext, 'height=".*"', '');

但是我不知道如何在 MySQL 查询中使用正则表达式.我确实发现它们存在，只是不知道如何在这种情况下使用它们.

But I don't know how to use regular expressions in MySQL query. I did find out they exist, I just don't se how I can use them in this context.

推荐答案

来源

试试下面的

DELIMITER $$
CREATE FUNCTION  `regex_replace`(pattern VARCHAR(1000),replacement VARCHAR(1000),original VARCHAR(1000))

RETURNS VARCHAR(1000)
DETERMINISTIC
BEGIN 
 DECLARE temp VARCHAR(1000); 
 DECLARE ch VARCHAR(1); 
 DECLARE i INT;
 SET i = 1;
 SET temp = '';
 IF original REGEXP pattern THEN 
  loop_label: LOOP 
   IF i>CHAR_LENGTH(original) THEN
    LEAVE loop_label;  
   END IF;
   SET ch = SUBSTRING(original,i,1);
   IF NOT ch REGEXP pattern THEN
    SET temp = CONCAT(temp,ch);
   ELSE
    SET temp = CONCAT(temp,replacement);
   END IF;
   SET i=i+1;
  END LOOP;
 ELSE
  SET temp = original;
 END IF;
 RETURN temp;
END$$
DELIMITER ;

并运行您的更新查询

UPDATE jos_content SET introtext = regex_replace('height=".*"', 'height=""',introtext);

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