Group Constructs

Pattern	Description
`(...)`	Capture everything enclosed
`(a\|b)`	Match either a or b
`(?:...)`	Match everything enclosed
`(?>...)`	Atomic group (non-capturing)
`(?\|...)`	Duplicate subpattern group number
`(?#...)`	Comment
`(?'name'...)`	Named Capturing Group
`(?<name>...)`	Named Capturing Group
`(?P<name>...)`	Named Capturing Group
`(?imsxXU)`	Inline modifiers
`(?(DEFINE)...)`	Pre-define patterns before using them

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