• Cheat: Download our grep cheat sheet for a quick reference to its many options and regex syntax. Parted Purpose: GNU parted isn't a daily-use command for most people, but it is one of the most powerful tools for hard-drive manipulation.
• In this Linux/Unix command line cheat sheet, you will learn: Basic Linux commands File Permission commands Environment Variables command User management commands of linux Networking command Process co.

• Python Regex Cheat Sheet
• Regex Cheat Sheet In R

Regular expressions (shortened as 'regex') are special strings representing a pattern to be matched in a search operation. They are an important tool in a wide variety of computing applications, from programming languages like Java and Perl, to text processing tools like grep, sed, and the text editor vim. Computer apps download for windows 7.

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.
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

Python Regex Cheat Sheet

✽ 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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Regex Cheat Sheet In R

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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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

Regex Cheat Sheet

133HS IV3HD )3938 CHEAT SHEET THE ULTIMATE CHEAT SHEET FOR REGULAR EXPRESSIONS A super quick reference guide for regular expressions (regex), including symbols, ranges, grouping, assertions and some sample patterns to get you started. Anchors, or atomic zero-width assertions, specify a position in the string where a match must occur. When you use an anchor in your search expression, the regular expression engine does not advance through the string or consume characters; it looks for a match in the specified position only. For example, ^ specifies that the match must start at the beginning of a line or string. Therefore, the regular expression Ahttp: matches 'http:' only when it occurs at the beginning of a line. The following table lists the anchors supported by the regular expressions in the .NET Framework. ANCHORS Start of string, or start of line in multi-line pattern Start of string End of string, or end of line in multi-line pattern End of string Word boundary Not word boundary LA $ IZ b B Start of word 1> End of word ZINITH data Isystems CHARACTER CLASSES Character Classes in regular expressions match a selection of characters at once. For example, 'Id' will match any digit from 0 to 9 inclusive. 'w' will match letters and digits, and 'W' will match everything and digits. c Control character White space Not white space A pattern to indentify letters, numbers or whitespace could be: ws s IS Digit Not digit Word ld D Iw IW Not word Hexadecimal digit Octal digit POSIX Portable Operating System Interface for unix' is a [:upper:] [:lower:] [talpha:] [:alnum:] [:digit:] [:xdigit:] [:punct:] [:blank:] [space:] [:cntrl:] [:graph:] [:print:] [:word:] Upper case letters collection of standards that define some of the Lower case letters functionality that a (UNIX) operating system should support. One of these standards defines two flavors of regular expressions. Commands involving regular expressions, such as grep and egrep, implement these flavors on POSIX-compliant UNIX systems. Several database systems also use POSIX regular expressions All letters Digits and letters Digits Hexadecimal digits Punctuation Space and tab Blank characters Control characters Printed characters Printed characters and spaces Digits, letters and underscore ASSERTIONS IBM Assertions are tricky to get to grips with, but once you are familiar with them, you will use them alarmingly often. They provide a way to say 'I want to find out every word in this document with a q in it, as long as that q isn't followed by werty'. The above code starts by matching non-whitespace characters ([^s]*), then a q (err . q). Then the parser reaches the lookahead assertion. This makes the q conditional. The q will only be matched if the assertion is true. In this case, the assertion is a negative assertion. It ?= Lookahead assertion ?! Negative lookahead [^s]'q{?!werty)[^s]* ?<= Lookbehind assertion Negative lookbehind Once-only Subexpression Condition [if then] Condition [if then else] ?!= or ? ?0 ?01 will be true if what it checks for is not found. ?# Comment Quantifiers allow you to specify a part of a pattem that must be matched a certain number of times. For example, if you QUANTIFIERS wanted to find out if a document contained between 10 and 20 (inclusive) of the letter 'a' in a row, you could use this pattern: a(10,20) Quantifier are 'greedy' by default. So the quantifier '+', which means 'one or more', will match as many items as possible. This can be a problem on occasion, so you can tell a quantifier to not be greedy (to be 'lazy'), using a modifier. Consider the following code: O or more {3} Exactly 3 1 or more {3,} 3 or more O or 1 {3,5} 3, 4 or 5 ? Add a ? to a quantifier to make it ungreedy. ESCAPE Regex use symbols to represent certain things. However, that presents a problem if you want to detect a character in a string where that character is a symbol. A period ('.') for example, in a regular expression, represents 'any character except the new line character'. If you want to find a period in a string, you can't just use '.' as a pattern - it will match just about everything. So, you need to tell the parser to treat the period as a literal period rather than a special character. Do with an escape character. S3DUBNÒ3S Escape following character Begin literal sequence End literal sequence Q E 'Escaping' is a way of treating characters which have a special meaning in regular expressions literally, rather than as special characters. SPECIAL CHARACTERS Special characters in regular expressions represent unusual elements in text. New lines and tabs, for example, can be typed using a keyboard, but are likely to trip up programming languages. The special characters use the escape character as well, to tell the regular expression parser that the following character is to be treated as a special character rather than a normal letter or number. In New line r Carriage return It Tab Iv Vertical tab f Form feed XxX Octal character xxX xhh Hex character hh 001000000I 9 B POVER A metacharacter is a special character in a COMMON META program or data field that provides information about other characters. It can express ideas on how to process the characters that follow the metacharacter, as the backslash character CHARACTERS sometimes is used to indicate that the charac- ters following it are to be treated in a special way. A common metacharacter usage is the wildcard character , which can represent any one character or any string of characters. 2$ { The escape character is usually R T V N GROUPS AND RANGES Groups and ranges are very very useful. Ranges are perhaps the easiest place to begin. They allow you to specify a selection of characters to match, Groups are essential to regular expressions, and are most often used when you want to use 'or' in a pattern, or you want to reference part of a pattern later in the same pattem, or where using regular expression string replacement. Any character except new line (n) a or b (alb) (..) (?:.) [abc] [^abc] [a-q] [A-Q] [0-7] Group Passive (non-capturing) group Range (a or b or c) Not a or b or c Lower case letter from a to q Upper case letter from A to Q Digit from 0 to 7 Group/subpattern number 'x' x PATTERN MODIFIERS Pattern modifiers are used in several languages, most notably Perl. These allow you to change how the parser works. For example, the 'i' modifier will tell the parser to ignore case. In Perl, regular expressions contain the same character at the beginning and end. This can be any character at all (often '/'), and is used like so: g Global match i* Case-insensitive Multiple lines Treat string as single line Allow comments and whitespace in pattern Evaluate replacement Ungreedy pattern m /pattern/ Modifiers would be added at the end of this, like so: s* e * /pattern/i U* PCRE modifier ZENITN data ISYstems STRING REPLACEMENT String replacement has already been covered above, however one small addition to note is the existence of 'passive' groups. These are groups that are ignored for the purposes of replacement. This is very useful when you want to match something that requires an 'or' section, but don't want it in the replacement. $n nth non-passive group 'xyz' in /^(abc(xyz))$/ 'xyz' in /^(?:abc)(xyz)$/ Before matched string After matched string Last matched string Entire matched string $2 $1 $ $ $+ $& Some regex implementations use instead of $. INFOGRAPHIC BY se up blog oda.com How to Build A Money Making Blog In 8 hours http://oxpandodramblings.com/indox.php/important-instagram-stats/ http://www.wikihow.com/Got-Followors-on-Instagram http://iphonephotographyschool.com/gain-followors-instagram/ http://www.huffingtonpost.com/global-yodol/how-to-got-moro-followors b_5511553.html https://blog.bufforapp.com/instagram-stats-instagram-tips http://blog.wishpond.com/pos/59138280816/47-tips-for-running-an-instagram-photo-contest http://www.slidoshare.net/TrackMaven/when-to-postslidesharepdf http://mashablo.com/2014/10/17/instagram-photos-infographic/

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