RegEx cheatsheet

Single characters

Use	To match character
`\p{ctgry}`	In that Unicode category or block
`\P{ctgry}`	Not in that Unicode category or block
`\w`	Word character (0-9A-Z_a-z)
`\W`	Non-word character
`\d`	Decimal digit
`\D`	Not a decimal digit
`\s`	White-space character
`\S`	Non-white-space char

Use	To specify position
`^`	At start of string or line
`\A`	At start of string
`\z`	At end of string
`\Z`	At end (or before \n at end) of string
`$`	At end (or before \n at end) of string or line
`\G`	Where previous match ended
`\b`	On word boundary
`\B`	Not on word boundary

Use	To define
`(<exp>)`	Indexed group
`(?<name><exp>)`	Named group e.g. (?<url>http.*)
`(?<name1-name2><exp>)`	Balancing group
`(?:<exp>)`	Noncapturing group
`(?=<exp>)`	Zero-width positive lookahead
`(?!<exp>)`	Zero-width negative lookahead
`(?<=<exp>)`	Zero-width positive lookbehind
`(?<!<exp>)`	Zero-width negative lookbehind
`(?><exp>)`	Non-backtracking (greedy)

Use	To
`(?imnsx-imnsx)`	Set or disable the specified options
`(?imnsx-imnsx:<exp>)`	Set or disable the specified options within the expression

Use	To match
`\n`	Indexed group
`\k<name>`	Named group

Use	To match
`a\|b`	Either a or b
`(?(<exp>)yes\|no)`	yes if is matched; no if isn't matched
`(?(name)yes\|no)`	yes if name is matched; no if name isn't matched

Use	To substitute
`$n`	Substring matched by group number n
`${name}`	Substring matched by group name
`$$`	Literal $ character
`$&`	Copy of whole match
$`	Text before the match
`$'`	Text after the match
`$+`	Last captured group
`$_`	Entire input string

Use	To
`(?# comment)`	Add inline comment
`#`	Add x-mode comment

For detailed information and examples, see https://aka.ms/regex
To test your regular expressions, see https://regexlib.com/RETester.aspx

Category	Description
`Lu`	Letter, uppercase
`Ll`	Letter, lowercase
`Lt`	Letter, title case
`Lm`	Letter, modifier
`Lo`	Letter, other
`L`	Letter, all
`Mn`	Mark, nonspacing combining
`Mc`	Mark, spacing combining
`Me`	Mark, enclosing combining
`M`	Mark, all diacritic
`Nd`	Number, decimal digit
`Nl`	Number, letterlike
`No`	Number, other
`N`	Number, all
`Pc`	Punctuation, connector
`Pd`	Punctuation, dash
`Ps`	Punctuation, opening mark
`Pe`	Punctuation, closing mark
`Pi`	Punctuation, initial quote mark
`Pf`	Puntuation, final quote mark
`Po`	Punctuation, other
`P`	Punctuation, all
`Sm`	Symbol, math
`Sc`	Symbol, currency
`Sk`	Symbol, modifier
`So`	Symbol, other
`S`	Symbol, all
`Zs`	Separator, space
`Zl`	Separator, line
`Zp`	Separator, paragraph
`Z`	Separator, all
`Cc`	Control code
`Cf`	Format control character
`Cs`	Surrogate code point
`Co`	Private-use character
`Cn`	Unassigned
`C`	Control characters, all

For named character set blocks (e.g., Cyrillic), search for "supported named blocks" in the MSDN Library.

Class: System.Text.RegularExpressions.Regex

Pattern matching with Regex objects

To initialize with	Use constructor
Regular exp	`Regex(String)`
+ options	`Regex(String,RegexOptions)`
+ time-out	`Regex(String,RegexOptions,TimeSpan)`

Pattern matching with static methods

Use an overload of a method below to supply the regular expression and the text you want to search.

Finding and replacing matched patterns

To	Use method
Validate match	`Regex.IsMatch`
Retrieve single match	`Regex.Match (first)`; `Match.NextMatch (next)`
Retrieve all matches	`Regex.Matches`
Replace match	`Regex.Replace`
Divide text	`Regex.Split`
Handle char escapes	`Regex.Escape`; `Regex.Unescape`

Getting info about regular expression patterns

To get	Use Regex API
Group names	`GetGroupNames`; `GetGroupNameFromNumber`
Group numbers	`GetGroupNumbers`; `GetGroupNumberFromName`
Expression	`ToString`
Options	`Options`
Time-out	`MatchTimeOut`
Cache size	`CacheSize`
Direction	`RightToLeft`