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This article mainly explains "what is the use of the backup structure of C#". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. let's study and learn "what is the use of the backup structure of C#"?

Standby structure

Alternate constructs are used to modify regular expressions to enable either/or matching.

The following table lists the alternate constructions:

Alternate construct description pattern match | matches any element separated by vertical bar (|) characters. "the" and "this" (? (expression) yes | no) in th (e | is | at) "the." if the regular expression pattern is specified by expression matching, match yes; otherwise match the optional no part. Expression is interpreted as a zero-width assertion. (? (a) A\ d {2}\ b |\ b\ d {3}\ b) "A10" and "910" in "A10 C103 910" (? (name) yes | no) if name or named or numbered capture groups match, match yes; otherwise match optional no. (?

Dogs.jpg and Yiska playing.jpg in "Dogs.jpg" Yiska playing.jpg "Dogs.jpg" thank you for reading. The above is the content of "what is the use of the backup structure of C#". After the study of this article, I believe you have a deeper understanding of the use of the backup structure of C#, and the specific usage still needs to be verified by practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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