<s>
GyazMail	B-Operating_System
is	O
an	O
email	B-Protocol
client	I-Protocol
for	O
macOS	B-Application
,	O
developed	O
and	O
maintained	O
by	O
Japanese	O
programmer	O
Goichi	O
Hirakawa	O
.	O
</s>
<s>
Gyazmail	B-Operating_System
is	O
based	O
on	O
the	O
native	O
macOS	B-Application
Cocoa	O
and	O
written	O
in	O
Objective-C	B-Language
.	O
For	O
its	O
search	O
function	O
,	O
GyazMail	B-Operating_System
uses	O
the	O
Oniguruma	B-Algorithm
regular	B-Algorithm
expression	I-Algorithm
library	I-Algorithm
,	O
which	O
supports	O
a	O
variety	O
of	O
character	B-General_Concept
encodings	I-General_Concept
,	O
which	O
is	O
especially	O
relevant	O
for	O
Asian	O
languages	O
.	O
</s>
