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The tables below are a reference to basic regex. While reading the rest of the site, when in doubt, you can always come back and look here. (It you want a bookmark, here's a direct link to the regex reference tables). I encourage you to print the tables so you have a cheat sheet on your desk for quick reference.

1. Regular Expression Powershell
2. Powershell Regular Expression Cheat Sheet Pdf
3. Regex Cheat Sheet Sql

Regular expressions can be made case insensitive using (?i). In backreferences, the strings can be converted to lower or upper case using L or U (e.g. This requires PERL = TRUE. CC BY Ian Kopacka. ian.kopacka@ages.at Regular expressions can conveniently be created using rex::rex. Powershell - Regular Expression - A regular expression is a special sequence of characters that helps you match or find other strings or sets of strings, using a specialized syntax held in a pat. The question was: is there any way to match physical drives to volume labels in Windows with PowerShell A Regular Expression Cheat Sheet for PowerShell Okay, so there's really not much that is PowerShell-specific about this cheat sheet, but I wrote it up in response to a post on microsoft.public.windows.powershell, and I thought I'd share it. A regular expression is a pattern used to match text. It can be made up of literal characters, operators, and other constructs. This article demonstrates regular expression syntax in PowerShell. PowerShell has several operators and cmdlets that use regular expressions. You can read more about their syntax and usage at the links below. Welcome back to the RegEx guide. Last post we talked a little bit about the basics of RegEx and its uses. I mentioned the most important thing is to understand the symbols. Today we’ll ease in with some of the basics to get us going.

The tables are not exhaustive, for two reasons. First, every regex flavor is different, and I didn't want to crowd the page with overly exotic syntax. For a full reference to the particular regex flavors you'll be using, it's always best to go straight to the source. In fact, for some regex engines (such as Perl, PCRE, Java and .NET) you may want to check once a year, as their creators often introduce new features.
The other reason the tables are not exhaustive is that I wanted them to serve as a quick introduction to regex. If you are a complete beginner, you should get a firm grasp of basic regex syntax just by reading the examples in the tables. I tried to introduce features in a logical order and to keep out oddities that I've never seen in actual use, such as the 'bell character'. With these tables as a jumping board, you will be able to advance to mastery by exploring the other pages on the site.

How to use the tables

The tables are meant to serve as an accelerated regex course, and they are meant to be read slowly, one line at a time. On each line, in the leftmost column, you will find a new element of regex syntax. The next column, 'Legend', explains what the element means (or encodes) in the regex syntax. The next two columns work hand in hand: the 'Example' column gives a valid regular expression that uses the element, and the 'Sample Match' column presents a text string that could be matched by the regular expression.
You can read the tables online, of course, but if you suffer from even the mildest case of online-ADD (attention deficit disorder), like most of us… Well then, I highly recommend you print them out. You'll be able to study them slowly, and to use them as a cheat sheet later, when you are reading the rest of the site or experimenting with your own regular expressions.
Enjoy!
If you overdose, make sure not to miss the next page, which comes back down to Earth and talks about some really cool stuff: The 1001 ways to use Regex.

Regex Accelerated Course and Cheat Sheet

For easy navigation, here are some jumping points to various sections of the page:
✽ Characters
✽ Quantifiers
✽ More Characters
✽ Logic
✽ More White-Space
✽ More Quantifiers
✽ Character Classes
✽ Anchors and Boundaries
✽ POSIX Classes
✽ Inline Modifiers
✽ Lookarounds
✽ Character Class Operations
✽ Other Syntax
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Characters

Character	Legend	Example	Sample Match
d	Most engines: one digit from 0 to 9	file_dd	file_25
d	.NET, Python 3: one Unicode digit in any script	file_dd	file_9੩
w	Most engines: 'word character': ASCII letter, digit or underscore	w-www	A-b_1
w	.Python 3: 'word character': Unicode letter, ideogram, digit, or underscore	w-www	字-ま_۳
w	.NET: 'word character': Unicode letter, ideogram, digit, or connector	w-www	字-ま‿۳
s	Most engines: 'whitespace character': space, tab, newline, carriage return, vertical tab	asbsc	a b c
s	.NET, Python 3, JavaScript: 'whitespace character': any Unicode separator	asbsc	a b c
D	One character that is not a digit as defined by your engine's d	DDD	ABC
W	One character that is not a word character as defined by your engine's w	WWWWW	*-+=)
S	One character that is not a whitespace character as defined by your engine's s	SSSS	Yoyo

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Quantifiers

Quantifier	Legend	Example	Sample Match
+	One or more	Version w-w+	Version A-b1_1
{3}	Exactly three times	D{3}	ABC
{2,4}	Two to four times	d{2,4}	156
{3,}	Three or more times	w{3,}	regex_tutorial
*	Zero or more times	A*B*C*	AAACC
?	Once or none	plurals?	plural

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More Characters

Character	Legend	Example	Sample Match
.	Any character except line break	a.c	abc
.	Any character except line break	.*	whatever, man.
.	A period (special character: needs to be escaped by a )	a.c	a.c
	Escapes a special character	.*+? $^/	.*+? $^/
	Escapes a special character	[{()}]	[{()}]

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Logic

Logic	Legend	Example	Sample Match
|	Alternation / OR operand	22|33	33
( … )	Capturing group	A(nt|pple)	Apple (captures 'pple')
1	Contents of Group 1	r(w)g1x	regex
2	Contents of Group 2	(dd)+(dd)=2+1	12+65=65+12
(?: … )	Non-capturing group	A(?:nt|pple)	Apple

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More White-Space

Character	Legend	Example	Sample Match
t	Tab	Ttw{2}	T ab
r	Carriage return character	see below
n	Line feed character	see below
rn	Line separator on Windows	ABrnCD	AB CD
N	Perl, PCRE (C, PHP, R…): one character that is not a line break	N+	ABC
h	Perl, PCRE (C, PHP, R…), Java: one horizontal whitespace character: tab or Unicode space separator
H	One character that is not a horizontal whitespace
v	.NET, JavaScript, Python, Ruby: vertical tab
v	Perl, PCRE (C, PHP, R…), Java: one vertical whitespace character: line feed, carriage return, vertical tab, form feed, paragraph or line separator
V	Perl, PCRE (C, PHP, R…), Java: any character that is not a vertical whitespace
R	Perl, PCRE (C, PHP, R…), Java: one line break (carriage return + line feed pair, and all the characters matched by v)

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More Quantifiers

Quantifier	Legend	Example	Sample Match
+	The + (one or more) is 'greedy'	d+	12345
?	Makes quantifiers 'lazy'	d+?	1 in 12345
*	The * (zero or more) is 'greedy'	A*	AAA
?	Makes quantifiers 'lazy'	A*?	empty in AAA
{2,4}	Two to four times, 'greedy'	w{2,4}	abcd
?	Makes quantifiers 'lazy'	w{2,4}?	ab in abcd

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Character Classes

Character	Legend	Example	Sample Match
[ … ]	One of the characters in the brackets	[AEIOU]	One uppercase vowel
[ … ]	One of the characters in the brackets	T[ao]p	Tap or Top
-	Range indicator	[a-z]	One lowercase letter
[x-y]	One of the characters in the range from x to y	[A-Z]+	GREAT
[ … ]	One of the characters in the brackets	[AB1-5w-z]	One of either: A,B,1,2,3,4,5,w,x,y,z
[x-y]	One of the characters in the range from x to y	[ -~]+	Characters in the printable section of the ASCII table.
[^x]	One character that is not x	[^a-z]{3}	A1!
[^x-y]	One of the characters not in the range from x to y	[^ -~]+	Characters that are not in the printable section of the ASCII table.
[dD]	One character that is a digit or a non-digit	[dD]+	Any characters, inc- luding new lines, which the regular dot doesn't match
[x41]	Matches the character at hexadecimal position 41 in the ASCII table, i.e. A	[x41-x45]{3}	ABE

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Anchors and Boundaries

Anchor	Legend	Example	Sample Match
^	Start of string or start of line depending on multiline mode. (But when [^inside brackets], it means 'not')	^abc .*	abc (line start)
$	End of string or end of line depending on multiline mode. Many engine-dependent subtleties.	.*? the end$	this is the end
A	Beginning of string (all major engines except JS)	Aabc[dD]*	abc (string.. ..start)
z	Very end of the string Not available in Python and JS	the endz	this is..n..the end
Z	End of string or (except Python) before final line break Not available in JS	the endZ	this is..n..the endn
G	Beginning of String or End of Previous Match .NET, Java, PCRE (C, PHP, R…), Perl, Ruby
b	Word boundary Most engines: position where one side only is an ASCII letter, digit or underscore	Bob.*bcatb	Bob ate the cat
b	Word boundary .NET, Java, Python 3, Ruby: position where one side only is a Unicode letter, digit or underscore	Bob.*bкошкаb	Bob ate the кошка
B	Not a word boundary	c.*BcatB.*	copycats

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POSIX Classes

Character	Legend	Example	Sample Match
[:alpha:]	PCRE (C, PHP, R…): ASCII letters A-Z and a-z	[8[:alpha:]]+	WellDone88
[:alpha:]	Ruby 2: Unicode letter or ideogram	[[:alpha:]d]+	кошка99
[:alnum:]	PCRE (C, PHP, R…): ASCII digits and letters A-Z and a-z	[[:alnum:]]{10}	ABCDE12345
[:alnum:]	Ruby 2: Unicode digit, letter or ideogram	[[:alnum:]]{10}	кошка90210
[:punct:]	PCRE (C, PHP, R…): ASCII punctuation mark	[[:punct:]]+	?!.,:;
[:punct:]	Ruby: Unicode punctuation mark	[[:punct:]]+	‽,:〽⁆

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Inline Modifiers

None of these are supported in JavaScript. In Ruby, beware of (?s) and (?m).

Modifier	Legend	Example	Sample Match
(?i)	Case-insensitive mode (except JavaScript)	(?i)Monday	monDAY
(?s)	DOTALL mode (except JS and Ruby). The dot (.) matches new line characters (rn). Also known as 'single-line mode' because the dot treats the entire input as a single line	(?s)From A.*to Z	From A to Z
(?m)	Multiline mode (except Ruby and JS) ^ and $ match at the beginning and end of every line	(?m)1rn^2$rn^3$	1 2 3
(?m)	In Ruby: the same as (?s) in other engines, i.e. DOTALL mode, i.e. dot matches line breaks	(?m)From A.*to Z	From A to Z
(?x)	Free-Spacing Mode mode (except JavaScript). Also known as comment mode or whitespace mode	(?x) # this is a # comment abc # write on multiple # lines [ ]d # spaces must be # in brackets	abc d
(?n)	.NET, PCRE 10.30+: named capture only	Turns all (parentheses) into non-capture groups. To capture, use named groups.
(?d)	Java: Unix linebreaks only	The dot and the ^ and $ anchors are only affected by n
(?^)	PCRE 10.32+: unset modifiers	Unsets ismnx modifiers

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Lookarounds

Lookaround	Legend	Example	Sample Match
(?=…)	Positive lookahead	(?=d{10})d{5}	01234 in 0123456789
(?<=…)	Positive lookbehind	(?<=d)cat	cat in 1cat
(?!…)	Negative lookahead	(?!theatre)thew+	theme
(?<!…)	Negative lookbehind	w{3}(?<!mon)ster	Munster

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Regular Expression Powershell

Character Class Operations

Class Operation	Legend	Example	Sample Match
[…-[…]]	.NET: character class subtraction. One character that is in those on the left, but not in the subtracted class.	[a-z-[aeiou]]	Any lowercase consonant
[…-[…]]	.NET: character class subtraction.	[p{IsArabic}-[D]]	An Arabic character that is not a non-digit, i.e., an Arabic digit
[…&&[…]]	Java, Ruby 2+: character class intersection. One character that is both in those on the left and in the && class.	[S&&[D]]	An non-whitespace character that is a non-digit.
[…&&[…]]	Java, Ruby 2+: character class intersection.	[S&&[D]&&[^a-zA-Z]]	An non-whitespace character that a non-digit and not a letter.
[…&&[^…]]	Java, Ruby 2+: character class subtraction is obtained by intersecting a class with a negated class	[a-z&&[^aeiou]]	An English lowercase letter that is not a vowel.
[…&&[^…]]	Java, Ruby 2+: character class subtraction	[p{InArabic}&&[^p{L}p{N}]]	An Arabic character that is not a letter or a number

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Other Syntax

Syntax	Legend	Example	Sample Match
K	Keep Out Perl, PCRE (C, PHP, R…), Python's alternate regex engine, Ruby 2+: drop everything that was matched so far from the overall match to be returned	prefixKd+	12
Q…E	Perl, PCRE (C, PHP, R…), Java: treat anything between the delimiters as a literal string. Useful to escape metacharacters.	Q(C++ ?)E	(C++ ?)

The 1001 ways to use Regex














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Short description

Describes regular expressions in PowerShell.

Long description

Note

This article will show you the syntax and methods for using regularexpressions in PowerShell, not all syntax is discussed. For a more completereference, see theRegular Expression Language - Quick Reference.

A regular expression is a pattern used to match text. It can be made up ofliteral characters, operators, and other constructs.

This article demonstrates regular expression syntax in PowerShell. PowerShellhas several operators and cmdlets that use regular expressions. You can readmore about their syntax and usage at the links below.

Powershell Regular Expression Cheat Sheet Pdf

PowerShell regular expressions are case-insensitive by default. Each methodshown above has a different way to force case sensitivity.

Method	Case Sensitivity
Select-String	use -CaseSensitive switch
switch statement	use the -casesensitive option
operators	prefix with 'c' (-cmatch, -csplit, or -creplace)

Character literals

A regular expression can be a literal character or a string. The expressioncauses the engine to match the text specified exactly.

Character classes

While character literals work if you know the exact pattern, character classesallow you to be less specific.

Character groups

[character group] allows you to match any number of characters one time,while [^character group] only matches characters NOT in the group.

If your list of characters to match includes the hyphen character (-), itmust be at the beginning or end of the list to distinguish it from a characterrange expression.

Character ranges

A pattern can also be a range of characters. The characters can be alphabetic [A-Z],numeric [0-9], or even ASCII-based [ -~] (all printable characters).

Numbers

The d character class will match any decimal digit. Download sediv full version. Conversely, D willmatch any non-decimal digit.

Word characters

The w character class will match any word character [a-zA-Z_0-9]. To matchany non-word character, use W.

Wildcards

The period (.) is a wildcard character in regular expressions. It will matchany character except a newline (n).

Whitespace

Whitespace is matched using the s character class. Any non-whitespacecharacter is matched using S. Literal space characters ' ' can also beused.

Regex Cheat Sheet Sql

Quantifiers

Quantifiers control how many instances of each element should be present in theinput string.

The following are a few of the quantifiers available in PowerShell:

Quantifier	Description
*	Zero or more times.
+	One or more times.
?	Zero or one time.
{n,m}	At least n, but no more than m times.

The asterisk (*) matches the previous element zero or more times. The resultis that even an input string without the element would be a match.

The plus sign (+) matches the previous element one or more times.

The question mark ? matches the previous element zero or one time. Likeasterisk *, it will even match strings where the element is absent.

The {n, m} quantifier can be used several different ways to allow granularcontrol over the quantifier. The second element m and the comma , areoptional.

Quantifier	Description
{n}	Match EXACTLY n number of times.
{n,}	Match at LEAST n number of times.
{n,m}	Match between n and m number of times.

Anchors

Anchors allow you to cause a match to succeed or fail based on the matchesposition within the input string.

The two commonly used anchors are ^ and $. The caret ^ matches the startof a string, and $, which matches the end of a string. The anchors allow youto match your text at a specific position while also discarding unwantedcharacters.

Note

When defining a regex containing an $ anchor, be sure to enclose the regexusing single quotes (') instead of double quotes (') or PowerShell willexpand the expression as a variable.

When using anchors in PowerShell, you should understand the difference betweenSingleline and Multiline regular expression options.

• Multiline: Multiline mode forces ^ and $ to match the beginning endof every LINE instead of the beginning and end of the input string.
• Singleline: Singleline mode treats the input string as a SingleLine.It forces the . character to match every character (including newlines),instead of matching every character EXCEPT the newline n.

To read more about these options and how to use them, visit theRegular Expression Language - Quick Reference.

Escaping characters

The backslash () is used to escape characters so they aren't parsed by theregular expression engine.

The following characters are reserved: []().^$|?*+{}.

You'll need to escape these characters in your patterns to match them in yourinput strings.

There`s a static method of the regex class that can escape text for you.

Note

Katy perry roar karaoke mp3 download. This escapes all reserved regular expression characters, including existingbackslashes used in character classes. Be sure to only use it on the portionof your pattern that you need to escape.

Other character escapes

There are also reserved character escapes that you can use to match specialcharacter types.

The following are a few commonly used character escapes:

Character Escape	Description
t	Matches a tab
n	Matches a newline
r	Matches a carriage return

Groups, Captures, and Substitutions

Grouping constructs separate an input string into substrings that can becaptured or ignored. Grouped substrings are called subexpressions. By defaultsubexpressions are captured in numbered groups, though you can assign names tothem as well.

A grouping construct is a regular expression surrounded by parentheses. Anytext matched by the enclosed regular expression is captured. The followingexample will break the input text into two capturing groups.

Use the $MatchesHashtable automatic variable to retrieve captured text.The text representing the entire match is stored at key 0.

Captures are stored in numeric Integer keys that increase from left toright. Capture 1 contains all the text until the username, capture 2contains just the username.

Important

The 0 key is an Integer. You can use any Hashtable method to accessthe value stored.

Named Captures

By default, captures are stored in ascending numeric order, from left to right.You can also assign a name to a capturing group. This name becomes akey on the $MatchesHashtable automatic variable.

Inside a capturing group, use ?<keyname> to store captured data under a namedkey.

The following example stores the newest log entry in the Windows Security Log.The provided regular expression extracts the username and domain from themessage and stores them under the keys:N for name and D for domain.

For more information, seeGrouping Constructs in Regular Expressions.

Substitutions in Regular Expressions

Using the regular expressions with the -replace operator allows you todynamically replace text using captured text.

<input> -replace <original>, <substitute>

• <input>: The string to be searched
• <original>: A regular expression used to search the input string
• <substitute>: A regular expression substitution expression to replacematches found in the input string.

Note

The <original> and <substitute> operands are subject to rules of theregular expression engine such as character escaping.

Capturing groups can be referenced in the <substitute> string. Thesubstitution is done by using the $ character before the group identifier.

Two ways to reference capturing groups are by Number and by Name.

• By Number - Capturing Groups are numbered from left to right.

• By Name - Capturing Groups can also be referenced by name.

The $& expression represents all the text matched.

Warning

Since the $ character is used in string expansion, you'll need to useliteral strings with substitution, or escape the $ character when usingdouble quotes.

Additionally, if you want to have the $ as a literal character, use $$instead of the normal escape characters. When using double quotes, stillescape all instances of $ to avoid incorrect substitution.

For more information, see Substitutions in Regular Expressions.

See also