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helloworld
test
x
(x)
[1]
[a]
[1-9]
[a-z]
\d\w\s
\d\W\S
a|bd
(?:abcd)
literal'
.
.*?
.*
\b
x{3}
\d{3}
-?
\d{2}-?\d{4}
x+
x?
[\w]
(?i:foo)
(?i)
[^abc]
foo{3,4}
[#!@$%^&*_+.?=]
[()]
[\/]
[\\]
"quoted"
[<>,;':"|`~]
[[]
[]]
a|
|a
|||
\W
\[
\]
[{}]
[/]
[\b]
[\@]
\x08
\x{0}
\x{00}
\x{000}
\x{0000}
from [\s\w]+
\|
æøå
\p{L}
\p{M}
[\p{L}\p{M}]
[\_]
[\<]
(?<name>foo)
\+
\d{1}?
[-\s]?
\(?\d{3}\)?
[-\s]?
\d{3}
[-\s]?
\d{4}
\O
\i
product_id=(?<product_id>\w+)