MySQL-如果以数字或特殊字符开头

问题描述

SELECT * 
FROM `thread` 
WHERE forumid NOT IN (1,2,3) AND IF( LEFT( title, 1) = '#', 1, 0)
ORDER BY title ASC

我有这个查询，如果它以#开头，它将选择某些内容.我想做的是，如果#是一个值，它将查找数字和特殊字符.或任何不正常的字母.

I have this query which will select something if it starts with a #. What I want to do is if # is given as a value it will look for numbers and special characters. Or anything that is not a normal letter.

我该怎么做?

推荐答案

如果要选择标题"不是以字母开头的所有行，请使用REGEXP:

If you want to select all the rows whose "title" does not begin with a letter, use REGEXP:

  SELECT * 
    FROM thread 
   WHERE forumid NOT IN (1,2,3)
     AND title NOT REGEXP '^[[:alpha:]]'
ORDER BY title ASC

• 否的意思是不是"(显然;))
• ^ 表示开头为"
• [[:: alpha:]] 表示仅字母字符"
• NOT means "not" (obviously ;))
• ^ means "starts with"
• [[:alpha:]] means "alphabetic characters only"

在MySQL手册中找到有关 REGEXP的更多信息.

Find more about REGEXP in MySQL's manual.

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