MySQL查询使用REGEXP找不到匹配的字符串

Question

I am using MySQL 5.5 .

I have a table named nutritions , having a column serving_data with text datatype.

Some of the values in serving_data column are like:

[{"label":"1 3\/4 cups","unit":"3\/4 cups"},{"label":"1 cups","unit":"3\/4 cups"},{"label":"1 container (7 cups ea.)","unit":"3\/4 cups"}]

Now, I want to find records containing serving_data like 1 3\\/4 cups .

For that I've made a query,

SELECT id,`name`,`nutrition_data`,`serving_data`
FROM `nutritions` WHERE serving_data REGEXP '(\d\s\\\D\d\scup)+';

But is seems not working.

Also I've tried

SELECT id,`name`,`nutrition_data`,`serving_data`
FROM `nutritions` WHERE serving_data REGEXP '/(\d\s\\\D\d\scup)+/g';

If I use the same pattern in http://regexr.com/ then it seems matching.

Can anyone help me?

Answer 1

Note that in MySQL regex, you cannot use shorthand classes like \\d , \\D or \\s , replace them with [0-9] , [^0-9] and [[:space:]] respectively.

You may use

REGEXP '[0-9]+[[:space:]][0-9]+\\\\/[0-9]+[[:space:]]+cup'

See the regex demo (note that in general, regex101.com does not support MySQL regex flavor, but the PCRE option supports the POSIX character classes like [:digit:] , [:space:] , so it is only used for a demo here, not as a proof it works with MySQL REGEXP ).

Pattern details :

• [0-9]+ - 1 or more digits
• [[:space:]] - a whitespace
• [0-9]+ - 1 or more digits
• \\\\\\\\/ - a literal \\/ char sequence
• [0-9]+[[:space:]]+cup - 1 or more digits, 1 or more whitespaces, cup .

Note that you may precise the word cup with a word boundary, add a [[:>:]] pattern after it to match a cup as a whole word.