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Regular
Expressions
101
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Quick Reference
Regular Expression
No Match
v1
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Regex Versions
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Delimiters
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~
@
;
%
`
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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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