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Last active October 17, 2016 08:02
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# Anchors
^ Start of string
$ End of string
# Ranges
[A-Za-z] any letter
[0-9] any digit
[349] matches 3, 4 or 9
[^5] any character except 5 (negation)
# Boundaries
\s whitespace
\S non-whitespace
\b word boundary
\B non-word boundary
# Quantifiers
* zero or more times
? zero or one time
+ one or more times
{n} exactly n times
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