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CODE EXAMPLE FOR JAVASCRIPT
username regex
^
(
?
=
[
a
-
zA
-
Z0
-
9
.
_
]
{
8
,
20
}
$
)
(
?
!
.
*
[
_
.
]
{
2
}
)
[
^
_
.
]
.
*
[
^
_
.
]
$
Source by stackoverflow.com #
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Tagged:
#username
#regex
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