Grouping Constructs
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· Subexpression ((subexpr))
· Named group ((?<name>subexpr))
· Balancing group definition ((?<name1-name2>subexpr))
· Non-capturing Group ((?:subexpr))
· Zero-width positive look-ahead assertion ((?=subexpr))
· Zero-width negative look-ahead assertion ((?!subexpr))
· Zero-width positive look-behind assertion ((?<=subexpr))
· Zero-width negative look-behind assertion ((?<!subexpr))
· Non-backtracking subexpression ((?>subexpr))
For detailed information on these constructs see the online reference at MSDN: