Regular
Expressions
101
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Regular
Expressions
101
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All your environment variables, in one place
Explanation
An explanation of your regex will be automatically generated as you type.
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Detailed match information will be displayed here automatically.
Quick Reference
Regular Expression
No Match
v1
Select Regex Version
Regex Versions
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Delimiters
/
~
@
;
%
`
#
Change delimiter
/
gm
Regex Flags
g
lobal
Don't return after first match
m
ulti line
^ and $ match start/end of line
i
nsensitive
Case insensitive match
e
x
tended
Ignore whitespace
e
X
tra
Disallow meaningless escapes
s
ingle line
Dot matches newline
u
nicode
Match with full unicode
U
ngreedy
Make quantifiers lazy
A
nchored
Anchor to start of pattern, or at the end of the most recent match
J
changed
Allow duplicate subpattern names
D
ollar end only
$ matches only end of pattern
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