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This document is a cheat sheet for regular expressions that provides descriptions and examples of common regex anchors, character classes, POSIX character classes, assertions, quantifiers, escape sequences, common metacharacters, special characters, groups and ranges, and pattern modifiers. It also includes examples of string replacement constructs in regular expressions. The cheat sheet was created by Dave Child and published on cheatography.com as a reference for using regular expressions.
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![Regular Expressions Cheat Sheet
by Dave Child (DaveChild) via cheatography.com/1/cs/5/
Regular Expressions Anchors
^ Start of string, or start of line in multi-line pattern
A Start of string
$ End of string, or end of line in multi-line pattern
Z End of string
b Word boundary
B Not word boundary
< Start of word
> End of word
Regular Expressions Character Classes
c Control character
s White space
S Not white space
d Digit
D Not digit
w Word
W Not word
x Hexadecimal digit
O Octal digit
Regular Expressions POSIX
[:upper:] Upper case letters
[:lower:] Lower case letters
[:alpha:] All letters
[:alnum:] Digits and letters
[:digit:] Digits
[:xdigit:] Hexadecimal digits
[:punct:] Punctuation
[:blank:] Space and tab
[:space:] Blank characters
[:cntrl:] Control characters
[:graph:] Printed characters
[:print:] Printed characters and spaces
[:word:] Digits, letters and underscore
Regular Expressions Assertions
?= Lookahead assertion
?! Negative lookahead
?<= Lookbehind assertion
?!= or ?<! Negative lookbehind
?> Once-only Subexpression
?() Condition [if then]
?()| Condition [if then else]
?# Comment
Regular Expressions Quantifiers
* 0 or more
+ 1 or more
? 0 or 1
{3} Exactly 3
{3,} 3 or more
{3,5} 3, 4 or 5
Add a ? to a quantifier to make it ungreedy.
Regular Expressions Escape Sequences
Escape following character
Q Begin literal sequence
E End literal sequence
"Escaping" is a way of treating characters which have
a special meaning in regular expressions literally,
rather than as special characters.
Regular Expression Common Metacharacters
^ [ .
$ { *
( +
) | ?
< >
The escape character is usually the backslash - .
Regular Expressions Special Characters
n New line
r Carriage return
t Tab
v Vertical tab
f Form feed
xxx Octal character xxx
xhh Hex character hh
Regular Expressions Groups and Ranges
. Any character except new line (n)
(a|b) a or b
(...) Group
(?:...) Passive (non-capturing) group
[abc] Range (a or b or c)
[^abc] Not a or b or c
[a-q] Letter from a to q
[A-Q] Upper case letter from A to Q
[0-7] Digit from 0 to 7
n nth group/subpattern
Ranges are inclusive.
Regular Expressions Pattern Modifiers
g Global match
i Case-insensitive
m Multiple lines
s Treat string as single line
x Allow comments and white space in pattern
e Evaluate replacement
U Ungreedy pattern
Regular Expressions String Replacement
$n nth non-passive group
$2 "xyz" in /^(abc(xyz))$/
$1 "xyz" in /^(?:abc)(xyz)$/
$` Before matched string
$' After matched string
$+ Last matched string
$& Entire matched string
Some regex implementations use instead of $.
Cheatographer
Dave Child (DaveChild)
cheatography.com/davechild/
www.addedbytes.com
Cheat Sheet
This cheat sheet was published on 19th October, 2011
and was last updated on 14th November, 2012.
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tagDreamMalar
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This test document contains sample formatting including bold, italic, and underlined text. It also includes an unordered list with 4 items and a table with 3 rows and 3 columns. The document demonstrates a page break and contains a paragraph with a footnote.tag
tagDreamMalar
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This test document contains sample formatting including bold, italic, and underlined text. It also includes an unordered list with 4 items and a table with 3 rows and 3 columns. The document demonstrates a page break and contains a paragraph with a footnote.example.pdf
example.pdfDreamMalar
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The document provides instructions for submitting papers to the ENTCS (Electronic Notes in Theoretical Computer Science) macro package. It explains that the paper must be formatted using either the entcsmacro.sty or prentcsmacro.sty style files. It also provides information on formatting the frontmatter, using environments like theorems and lemmas, adding references, and producing a PDF file.LAtest Doc
LAtest DocDreamMalar
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This document provides tips for creating effective PowerPoint slides by avoiding common pitfalls. It addresses how to structure slides with outlines and bullet points, use fonts and colors that are easy to read, include graphs and charts to visualize data, check for spelling and grammar errors, and conclude with a clear summary and invitation for questions. Key recommendations include using a large font size, limiting each slide to 4-5 main points, choosing high contrast colors, including descriptive titles on all visuals, and proofreading for clarity and correctness.NetworkSecurity.ppt
NetworkSecurity.pptDreamMalar
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The document proposes two solutions for secure internet banking authentication - one based on short-time passwords using smart cards and symmetric cryptography, and the other based on digital certificates. It discusses attacks on authentication like offline credential stealing and online channel breaking. The short-time password solution involves the user copying a response from their smart card to a bank login form. The certificate-based solution establishes an SSL/TLS channel without client authentication initially and then uses the smart card certificates for authentication. Both solutions offer high security against common attacks but certificate-based authentication may be more attractive long-term as e-IDs spread.Sample.ppt
Sample.pptDreamMalar
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This document provides information about the HelloPT application, which allows users to control PowerPoint presentations from an iPhone or iPod touch. HelloPT allows users to view slides, navigate between slides, and use the screen as a digital whiteboard. It also displays notes entered in PowerPoint files. To use HelloPT, it must be installed on a Windows server along with PowerPoint 2000/2003/2007/2010. The application works for iPhone/iPod touch devices running iOS 2.2.1 or higher.not from widget
not from widgetDreamMalar
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This document provides tips for creating effective PowerPoint slides and avoiding pitfalls of bad slides. It covers topics like outlines, slide structure, fonts, color, backgrounds, graphs, spelling and grammar. For slide structure, it recommends using point form, including 4-5 points per slide, and showing one point at a time. For fonts, it suggests using a large, easy-to-read font like Arial. For color, it advises using contrasting font/background colors and being consistent. For graphs, it says to include titles and use graphs over tables when possible. It also stresses proofreading for errors.Document.docx.docx
Document.docx.docxDreamMalar
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This document tests the compatibility of document formatting and elements across different word processing applications. It contains various formatting styles, layouts, and elements like headings, bullets, tables, images, and drawings. The document is originally created in Microsoft Word 2007 in DOCX format. When opened in other applications, it checks if the original styles, layouts, and elements are preserved or changed/lost in formatting and display. The document acts as a prototype to see how well different applications maintain compatibility when opening a file created in another application.PDF2.pdf
PDF2.pdfDreamMalar
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This document provides an overview of the Centers for Disease Control and Prevention's (CDC) use of Facebook and other social media platforms. It discusses CDC's strategy of using social media to disseminate public health information to diverse audiences. It highlights CDC's Facebook page which has over 54,000 fans, and the "i know" campaign page which focuses on HIV prevention among young African Americans. The document also outlines CDC's social media best practices around compliance, accessibility, and interaction with users.1934015245 Software TestingA.pdf
1934015245 Software TestingA.pdfDreamMalar
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This document provides guidelines and information for preparing a resume for software testing interviews. It includes a sample resume on the accompanying CD and discusses including an objective, experience, projects, education, and limiting the resume to 4-5 pages. The document also provides an organizational hierarchy for software development roles to help candidates understand the levels and requirements of different positions.Ad
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- 1. Regular Expressions Cheat Sheet by Dave Child (DaveChild) via cheatography.com/1/cs/5/ Regular Expressions Anchors ^ Start of string, or start of line in multi-line pattern A Start of string $ End of string, or end of line in multi-line pattern Z End of string b Word boundary B Not word boundary < Start of word > End of word Regular Expressions Character Classes c Control character s White space S Not white space d Digit D Not digit w Word W Not word x Hexadecimal digit O Octal digit Regular Expressions POSIX [:upper:] Upper case letters [:lower:] Lower case letters [:alpha:] All letters [:alnum:] Digits and letters [:digit:] Digits [:xdigit:] Hexadecimal digits [:punct:] Punctuation [:blank:] Space and tab [:space:] Blank characters [:cntrl:] Control characters [:graph:] Printed characters [:print:] Printed characters and spaces [:word:] Digits, letters and underscore Regular Expressions Assertions ?= Lookahead assertion ?! Negative lookahead ?<= Lookbehind assertion ?!= or ?<! Negative lookbehind ?> Once-only Subexpression ?() Condition [if then] ?()| Condition [if then else] ?# Comment Regular Expressions Quantifiers * 0 or more + 1 or more ? 0 or 1 {3} Exactly 3 {3,} 3 or more {3,5} 3, 4 or 5 Add a ? to a quantifier to make it ungreedy. Regular Expressions Escape Sequences Escape following character Q Begin literal sequence E End literal sequence "Escaping" is a way of treating characters which have a special meaning in regular expressions literally, rather than as special characters. Regular Expression Common Metacharacters ^ [ . $ { * ( + ) | ? < > The escape character is usually the backslash - . Regular Expressions Special Characters n New line r Carriage return t Tab v Vertical tab f Form feed xxx Octal character xxx xhh Hex character hh Regular Expressions Groups and Ranges . Any character except new line (n) (a|b) a or b (...) Group (?:...) Passive (non-capturing) group [abc] Range (a or b or c) [^abc] Not a or b or c [a-q] Letter from a to q [A-Q] Upper case letter from A to Q [0-7] Digit from 0 to 7 n nth group/subpattern Ranges are inclusive. Regular Expressions Pattern Modifiers g Global match i Case-insensitive m Multiple lines s Treat string as single line x Allow comments and white space in pattern e Evaluate replacement U Ungreedy pattern Regular Expressions String Replacement $n nth non-passive group $2 "xyz" in /^(abc(xyz))$/ $1 "xyz" in /^(?:abc)(xyz)$/ $` Before matched string $' After matched string $+ Last matched string $& Entire matched string Some regex implementations use instead of $. Cheatographer Dave Child (DaveChild) cheatography.com/davechild/ www.addedbytes.com Cheat Sheet This cheat sheet was published on 19th October, 2011 and was last updated on 14th November, 2012. Sponsor FeedbackFair, increase your conversion rate today! Try it free! http://www.FeedbackFair.com