\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{doublehelix}
\pdfinfo{
  /Title (the-complete-regex.pdf)
  /Creator (Cheatography)
  /Author (doublehelix)
  /Subject (The complete RegEx Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{B34B4B}
\definecolor{LightBackground}{HTML}{FAF3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{The complete RegEx Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{doublehelix} via \textcolor{DarkBackground}{\uline{cheatography.com/27391/cs/7932/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}doublehelix \\
  \uline{cheatography.com/doublehelix} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 30th January, 2017.\\
   Updated 25th February, 2020.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{p{0.8 cm} x{7.2 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Anchors (boundaries)}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textasciicircum{} & Start of string or line \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\$ & End of string or line \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\textbackslash{}A & Start of input (ignores 'm' flag) \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\textbackslash{}Z & End of input (ignores 'm' flag) \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}G & End of the previous match \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\textbackslash{}b & Word boundary (any position proceeded or followed - but not both - by a letter, digit or underscore) \tn 
% Row Count 8 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\textbackslash{}B & Non-word boundary \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{0.76 cm} x{3.268 cm} x{3.572 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{8.4cm}}{\bf\textcolor{white}{Character and Sets}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textbackslash{}w & Word & {[}a-zA-Z0-9\_{]} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\textbackslash{}W & Non-word & {[}\textasciicircum{}a-zA-Z0-9\_{]} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\textbackslash{}d & Digit & {[}0-9{]} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\textbackslash{}D & Non-digit &  \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}s & Whitespace (Form-feed, tab, vertical-tab, new line, carriage return and space) & {[}\textbackslash{}f\textbackslash{}t\textbackslash{}x0b\textbackslash{}n\textbackslash{}r {]} \tn 
% Row Count 9 (+ 5)
% Row 5
\SetRowColor{white}
\textbackslash{}S & Non-whitespace &  \tn 
% Row Count 10 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\textbackslash{}x & Hexadecimal digit & \textbackslash{}x00=null; \textbackslash{}x0d=\textbackslash{}r; {[}\textbackslash{}x61-\textbackslash{}x7a{]}={[}a-z{]} \tn 
% Row Count 13 (+ 3)
% Row 7
\SetRowColor{white}
\textbackslash{}O & Octal digit &  \tn 
% Row Count 14 (+ 1)
% Row 8
\SetRowColor{LightBackground}
. & Any character (except new line \textbackslash{}n) &  \tn 
% Row Count 16 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{1.36 cm} x{6.64 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Groups}}  \tn
% Row 0
\SetRowColor{LightBackground}
(...) & Capture group - captures a set of characters for a later expression \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\seqsplit{(?:...)} & Non-capture group - groups an expression but does not capture. e.g. /((?:foo|fu)bar)/ matches "foobar" or "fubar" without "foo" or "fu" appearing as a captured subpattern \tn 
% Row Count 9 (+ 6)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{(?=...)} & Lookahead - match on the characters following. e.g. /ab(?=c)/ match "ab" only when followed by "c" \tn 
% Row Count 12 (+ 3)
% Row 3
\SetRowColor{white}
(?!...) & Negative lookahead - match on characters that aren't following. e.g. /ab(?!c)/ match "ab" only when NOT followed by "c" \tn 
% Row Count 16 (+ 4)
% Row 4
\SetRowColor{LightBackground}
(?\textless{}=...) & Positive look-behind assertion. e.g. /(?\textless{}=foo)bar/ matches "bar" when preceded by "foo" \tn 
% Row Count 19 (+ 3)
% Row 5
\SetRowColor{white}
(?\textless{}!...) & Negative look-behind assertion. e.g. /(?\textless{}!foo)bar/ - matches "bar" when not preceded by "foo" \tn 
% Row Count 22 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{(?\#...)} & Comment e.g. (?\# This comment is ignored entirely) \tn 
% Row Count 24 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.24 cm} x{5.76 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Unicode character support}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textbackslash{}x0000-\textbackslash{}xFFFF & Unicode hexadecimal character set \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\textbackslash{}x00-\textbackslash{}xFF & ASCII hexadecimal character set \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\textbackslash{}cA-\textbackslash{}cZ & Control characters \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{Unicode is not fully supported on all platforms. JavaScript prior to ES6 for example allows ASCII hex but not full Unicode hex.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{0.96 cm} x{7.04 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Special Characters}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textbackslash{}n & New line \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\textbackslash{}r & Carriage return \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\textbackslash{}t & Tab \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\textbackslash{}v & Vertical tab \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}f & Form feed \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{0.88 cm} x{7.12 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Quantifiers}}  \tn
% Row 0
\SetRowColor{LightBackground}
* & Zero or more \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
+ & One or more \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
? & Zero or One (i.e. optional) \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\{n\} & Exactly 'n' (any number) \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\{n,\} & Minimum ('n' or more) \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\{n,m\} & Range ('n' or more, but less or equal to 'm') \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{0.8 cm} x{7.2 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Flags (expression modifiers)}}  \tn
% Row 0
\SetRowColor{LightBackground}
/m & Milti-line. (Makes \textasciicircum{} and \$ match the start and end of a line respectively) \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
/s & Treat input as a single line. (Makes '.' match new lines as well) \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
/i & Case insensitive pattern matching. \tn 
% Row Count 6 (+ 1)
% Row 3
\SetRowColor{white}
/g & Global matching. (Don't stop after first match in a replacement function) \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
/x & Extended matching. (disregard white-space not explicitly escaped, and allow comments starting with \#) \tn 
% Row Count 12 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Escape Characters}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{In regular expressions, the following characters have special meaning and must be escaped: `\textasciicircum{} \$ {[} \{ ( ) \textless{} \textgreater{} . * \textbackslash{} + | ?` \newline % Row Count 3 (+ 3)
Additionally the hyphen (-) and close square bracket ({]}) must be escaped when in an expression set (`{[}...{]}`). \newline % Row Count 6 (+ 3)
e.g. `/\textbackslash{}(\textbackslash{}d\{3\}\textbackslash{}) \textbackslash{}d\{4\}{[}\textbackslash{}- {]}\textbackslash{}d\{4\}/` matches "(nnn) nnnn-nnnn" or "(nnn) nnnn nnnn" (where n is a numeric digit).% Row Count 9 (+ 3)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}