i
Hate
Regex
Library
Cheatsheet
Community
Open playground
New private workspace
Regex title
Checking session
Sign in to save
JavaScript
Expression
/
Regular expression
^
[a-z0-9_-]
{3,16}
$
^[a-z0-9_-]{3,16}$
/
gmi
g
global
i
ignore case
m
multiline
s
dot all
u
unicode
y
sticky
Test bench
Sample text
2 matches
dev_user
regex-fan
no spaces ab
dev_user regex-fan no spaces ab
Structure
Railroad diagram
SVG
PNG
Live