drop table if exists t1;
create table t1 (s1 char(64),s2 char(64));
insert into t1 values('aaa','aaa');
insert into t1 values('aaa|qqq','qqq');
insert into t1 values('gheis','^[^a-dXYZ]+$');
insert into t1 values('aab','^aa?b');
insert into t1 values('Baaan','^Ba*n');
insert into t1 values('aaa','qqq|aaa');
insert into t1 values('qqq','qqq|aaa');
insert into t1 values('bbb','qqq|aaa');
insert into t1 values('bbb','qqq');
insert into t1 values('aaa','aba');
insert into t1 values(null,'abc');
insert into t1 values('def',null);
insert into t1 values(null,null);
insert into t1 values('ghi','ghi[');
select HIGH_PRIORITY s1 regexp s2 from t1;
s1 regexp s2
1
1
1
1
1
1
1
0
0
0
NULL
NULL
NULL
NULL
drop table t1;
create table t1 (xxx char(128));
insert into t1 (xxx) values('this is a test of some long text to see what happens');
select * from t1 where xxx regexp('is a test of some long text to');
xxx
this is a test of some long text to see what happens
explain extended select * from t1 where xxx regexp('is a test of some long text to');
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
Warnings:
Note	1003	select 'this is a test of some long text to see what happens' AS `xxx` from `test`.`t1` where ('this is a test of some long text to see what happens' regexp _latin1'is a test of some long text to')
select * from t1 where xxx regexp('is a test of some long text to ');
xxx
this is a test of some long text to see what happens
select * from t1 where xxx regexp('is a test of some long text to s');
xxx
this is a test of some long text to see what happens
select * from t1 where xxx regexp('is a test of some long text to se');
xxx
this is a test of some long text to see what happens
drop table t1;
create table t1 (xxx char(128));
insert into t1 (xxx) values('this is some text: to test - out.reg exp (22/45)');
select * from t1 where xxx REGEXP '^this is some text: to test - out\\.reg exp [[(][0-9]+[/\\][0-9]+[])][ ]*$';
xxx
this is some text: to test - out.reg exp (22/45)
drop table t1;
select _latin1 0xFF regexp _latin1 '[[:lower:]]' COLLATE latin1_bin;
_latin1 0xFF regexp _latin1 '[[:lower:]]' COLLATE latin1_bin
1
select _koi8r  0xFF regexp _koi8r  '[[:lower:]]' COLLATE koi8r_bin;
_koi8r  0xFF regexp _koi8r  '[[:lower:]]' COLLATE koi8r_bin
0
select _latin1 0xFF regexp _latin1 '[[:upper:]]' COLLATE latin1_bin;
_latin1 0xFF regexp _latin1 '[[:upper:]]' COLLATE latin1_bin
0
select _koi8r  0xFF regexp _koi8r  '[[:upper:]]' COLLATE koi8r_bin;
_koi8r  0xFF regexp _koi8r  '[[:upper:]]' COLLATE koi8r_bin
1
select _latin1 0xF7 regexp _latin1 '[[:alpha:]]';
_latin1 0xF7 regexp _latin1 '[[:alpha:]]'
0
select _koi8r  0xF7 regexp _koi8r  '[[:alpha:]]';
_koi8r  0xF7 regexp _koi8r  '[[:alpha:]]'
1
select _latin1'a' regexp _latin1'A' collate latin1_general_ci;
_latin1'a' regexp _latin1'A' collate latin1_general_ci
1
select _latin1'a' regexp _latin1'A' collate latin1_bin;
_latin1'a' regexp _latin1'A' collate latin1_bin
0
create table t1 (a varchar(40));
insert into t1 values ('C1'),('C2'),('R1'),('C3'),('R2'),('R3');
prepare stmt1 from 'select a from t1 where a rlike ? order by a';
set @a="^C.*";
execute stmt1 using @a;
a
C1
C2
C3
set @a="^R.*";
execute stmt1 using @a;
a
R1
R2
R3
deallocate prepare stmt1;
drop table t1;