mysql - 使用 SQL 进行模式匹配

Question

我需要使用 SQL 匹配下面提到的模式。

1. “* 谢谢你”
2. “* 音乐 *”
3. “我喜欢音乐”
4. “我喜欢*音乐和*绘画”

输入字符串如下所示，
“HI THANK YOU” -> 应该匹配“* THANK YOU”
“我非常喜欢音乐” -> 应该匹配“* MUSIC *”

有没有办法使用标准 SQL 语法来做到这一点。

请帮忙。

谢谢你。

Answer 1

Oracle MySQL Sample Queries:

Case insensitive:

select * from database where column like '%THANK YOU%';

Case sensitive:

select * from database where column LIKE BINARY '%THANK YOU%';

Case insensitive:

select * from database where column REGEXP 'THANK YOU';

Oracle Queries:

select * from database WHERE REGEXP_LIKE(column, 'THANK YOU', 'i')

You can use LIKE in Oracle, but case insensitivity setup depends on the version.

Case sensitive:

select * from database WHERE column LIKE 'THANK YOU';

There is a lot of discussion about making Oracle's like case insensitive. It's easier to use the reg_exp version for that and set the i flag for case insensitivity.

Update The original question was actually opposite of my first answer, and it has really opened up my head about quite a few apps that I'm building for datamining. Actually had this idea last night but the original poster posted it before I did (Fiddle was down). You can make Regex match both sides of the REGEXP function in MySQL. So if you store a list of expressions into the database, then you can actually compare the list of expressions against a table of entries or a single string.

I've added an SQL Fiddle here: http://sqlfiddle.com/#!8/701a0/2

Note that in the original example, the "regex" values in the database started with just an asterisk. In Regex, the actual string would need to be .* for possibly any character.

I've added a few examples for matching things like websites, US Toll Free Numbers, and gmail accounts.

INSERT INTO `myRegex` VALUES (1,'.* THANK YOU$'),(2,'MUSIC'),(3,'I LIKE .* MUSIC'),(4,'I LIKE .* MUSIC AND .* PAINTING'),(5,'^[0-9]?[ .-]?(800|866)'),(6,'\\.com$'),(7,'\\.net$'),(8,'\\.(gmail|googlemail)\\.'),(9,'THANK YOU');

Output

select * from myRegex where 'HI THANK YOU' REGEXP reg_expr;

select * from myRegex where 'THANK YOU MUCH' REGEXP reg_expr;

Answer 2

我找到了一种使用 MySQL 的方法，

SELECT * FROM Knowledge WHERE 'HI THANK YOU' REGEXP pattern_col;

pattern_col 包含正则表达式。