---
{
    "title": "not regexp",
    "language": "en"
}
---

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# not regexp
## description
### syntax

`BOOLEAN not regexp(VARCHAR str, VARCHAR pattern)`

Perform regular matching on the string str, return false if it matches, and return true if it doesn't match. pattern is a regular expression.

## example

```
// Find all data in the k1 field that does not start with 'billie'
mysql> select k1 from test where k1 not regexp '^billie';
+--------------------+
| k1                 |
+--------------------+
| Emmy eillish       |
+--------------------+

// Find all the data in the k1 field that does not end with 'ok':
mysql> select k1 from test where k1 not regexp 'ok$';
+------------+
| k1         |
+------------+
| It's true  |
+------------+
```

## keyword
REGEXP, NOT, NOT REGEXP