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Characters:
abc
Direct match characters
Character classes:
Any digit
Distinguish different types of characters
Ranges:
One of
a - z
Matches any one of the enclosed characters
None of
a - z
Matches anything that is not enclosed in the brackets
Choice:
a
b
Matches either "x" or "y"
Quantifier:
0 -
a
Indicate numbers of characters or expressions to match
Group:
Group #1
x
Matches x and remembers the match
x
Matches "x" but does not remember the match
Group #Name
x
Matches "x" and stores it on the groups property of the returned matches under the name specified by <Name>
Back reference:
Back reference #1
A back reference to match group #1
Back reference #name
A back reference to match group #Name
Assertion:
Begin with
Matches the beginning of input
x
Followed by:
y
Matches "x" only if "x" is followed by "y"