MySQL REGEXP 数字完全匹配不起作用

Question

I have this query:

SELECT foo FROM bar WHERE foo REGEXP '[[:digit:]]{10}';

Which is returning bar rows where foo is longer in number of characters than 10.

Same happens if I try with [0-9]{10} . It's like it's not taking into account the {10} to match exactly those rows where foo contains only 10 digits.

The expected regular expression should be matching values like:

1231231231

Only digits, 10 characters, but isn't.

foo is a string column. I'm using mysql Ver 14.14 Distrib 5.7.26, for Linux (x86_64).

Answer 1

Place anchors around your regex pattern. Also, I prefer using [0-9] to represent any digit, because it is more portable to other regex flavors.

SELECT foo
FROM bar
WHERE foo REGEXP '^[0-9]{10}$';

Note that I also placed ^ and $ anchors around the pattern, to ensure that the entire foo column must be ten digits.