C# - Alternation Constructs Regular Expressions

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Alternation constructs modify a regular expression to enable either/or matching. The following table lists the alternation constructs:

Alternation constructDescriptionPatternMatches
|Matches any one element separated by the vertical bar (|) character.th(e|is|at)"the", "this" in "this is the day. "
(?( expression )yes | no )Matches yes if expression matches; otherwise, matches the optional no part. Expression is interpreted as a zero-width assertion.(?(A)A\d{2}\b|\b\d{3}\b)"A10", "910" in "A10 C103 910"
(?( name )yes | no )Matches yes if the named capture name has a match; otherwise, matches the optional no.(?< quoted>")?(?(quoted).+?"|\S+\s)Dogs.jpg, "Yiska playing.jpg" in "Dogs.jpg "Yiska playing.jpg""


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