------+-----------------------+
| 'a' REGEXP 'A' | 'a' REGEXP BINARY 'A' |
+----------------+-----------------------+
|              1 |                     0 |
+----------------+-----------------------+

SELECT 'a' REGEXP '^[a-d]';
+---------------------+
| 'a' REGEXP '^[a-d]' |
+---------------------+
|                   1 |
+---------------------+

default_regex_flags examples
----------------------------

MariaDB 10.0.11 introduced the default_regex_flags variable to address the
remaining compatibilities between PCRE and the old regex library.

The default behaviour (multiline match is off)

SELECT 'a\nb\nc' RLIKE '^b$';
+---------------------------+
| '(?m)a\nb\nc' RLIKE '^b$' |
+---------------------------+
|                         0 |
+---------------------------+

Enabling the multiline option using the PCRE option syntax:

SELECT 'a\nb\nc' RLIKE '(?m)^b$';
+---------------------------+
| 'a\nb\nc' RLIKE '(?m)^b$' |
+---------------------------+
|                         1 |
+---------------------------+

Enabling the multiline option using default_regex_flags

SET default_regex_flags='MULTILINE';
SELECT 'a\nb\nc' RLIKE '^b$';
+-----------------------+
| 'a\nb\nc' RLIKE '^b$' |
+-----------------------+
|                     1 |
+-----------------------+

URL: https://mariadb.com/kb/en/regexp/https://mariadb.com/kb/en/regexp/