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Regular
Expressions
101
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Unit Tests (19)
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Explanation
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Quick Reference
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All Tokens
Common Tokens
General Tokens
Anchors
Meta Sequences
Quantifiers
Group Constructs
Character Classes
Flags/Modifiers
Substitution
A single character of: a, b or c
[abc]
A character except: a, b or c
[^abc]
A character in the range: a-z
[a-z]
A character not in the range: a-z
[^a-z]
A character in the range: a-z or A-Z
[a-zA-Z]
Any single character
.
Alternate - match either a or b
a|b
Any whitespace character
\s
Any non-whitespace character
\S
Any digit
\d
Any non-digit
\D
Any word character
\w
Any non-word character
\W
Match everything enclosed
(?:...)
Capture everything enclosed
(...)
Zero or one of a
a?
Zero or more of a
a*
One or more of a
a+
Exactly 3 of a
a{3}
3 or more of a
a{3,}
Between 3 and 6 of a
a{3,6}
Start of string
^
End of string
$
A word boundary
\b
Non-word boundary
\B
Regular Expression
v1
/
/
gm
Unit Tests
starts with hyphen (-)
starts with underscore (_)
starts with number (0)
ends with hyphen (-)
ends with underscore (_)
has space (one)
has space (multiple)
length (too short)
length (too long)
user-_name
user_-name
user-_-_-_-name
user__name
user--name
username0
username0123
user0123name0123
url space encoding 1
url space encoding 2
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