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MySQL | NOT REGEXP

Database
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MySQL
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Documentation
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Operators
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's NOT REGEXP operator returns 1 if the expr string does not match the regular expression pat. If there is a match 0 is returned.

Syntax

SELECT expr NOT REGEXP pat;

1. expr | string

The string we are matching with regular expression pattern.

2. pat | regular expression

The regular expression pattern for matching.

Examples

Consider the following table about some students:

student_id

fname

lname

day_enrolled

age

username

1

Sky

Towner

2015-12-03

17

stowner1

2

Ben

Davis

2016-04-20

19

bdavis2

3

Travis

Apple

2018-08-14

18

tapple3

4

Arthur

David

2016-04-01

16

adavid4

5

Benjamin

Town

2014-01-01

17

btown5

The above sample table can be created using the code here.

Basic usage

To check whether student last names do not match the regular expression pattern '[ae]':

SELECT lname, lname NOT REGEXP '[ae]'
FROM students;
+--------+-------------------------+
| lname | lname NOT REGEXP '[ae]' |
+--------+-------------------------+
| Towner | 0 |
| Davis | 0 |
| Apple | 0 |
| David | 0 |
| Town | 1 |
+--------+-------------------------+

Only 'Town' returns 1 as it does not contain an 'a' or an 'e'.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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