Regular Expressions in C #

Common Expressions　　　　

^: Represents the beginning of a string

$: Indicates the end of a string

.: matches any single character except \ n

[]: Filtering of characters

[] The content in the [] can only appear in one

|: Meaning of "or"

(): Change operation priority and extraction Group

*: Qualifier, indicating that the preceding expression appears 0 or more times

+: Qualifier, expression of the preceding expression appears at least once (one or more times)

？ : Qualifier, which indicates that the preceding expression must appear 0 or one time

{n}: Qualifier, indicating that the preceding expression must appear n times

{N,}: qualifier, indicating that the preceding expression appears at least n times

{n,m}: Qualifier, indicating that the preceding expression appears at least n times, at most, M-Times

\d: Equivalent to [0-9]

\d: Equivalent to [^0-9]

\s: Represents all whitespace, invisible characters

\s: denotes all characters except \s

\w: means [0-9a-za-z]

\w: represents all characters except \w

Common Functions

Regex.IsMatch (); Determine if the match

Regex.match (); Extract a match

Regex.Matches (); Extract all Matches

Regex.Split (); Segmentation

Regex.Replace (); Replace

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Regular Expressions in C #