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Performing regular expression replace in MySQL

Database
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MySQL
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Functions Cookbooks
schedule Jul 1, 2022
Last updated
local_offer MySQL
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We can perform regular expression replace in MySQL using the REGEXP_REPLACE(~) method.

Example

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.

To replace all lowercase characters in student usernames with '-':

SELECT username, REGEXP_REPLACE(username, '[a-z]', '-', 1, 0, 'c')
FROM students;
+----------+---------------------------------------------------+
| username | REGEXP_REPLACE(username, '[a-z]', '-', 1, 0, 'c') |
+----------+---------------------------------------------------+
| stowner1 | -------1 |
| bdavis2 | ------2 |
| tapple3 | ------3 |
| adavid4 | ------4 |
| btown5 | -----5 |
+----------+---------------------------------------------------+
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Published by Arthur Yanagisawa
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