\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{tempusername12346455}
\pdfinfo{
  /Title (pcre.pdf)
  /Creator (Cheatography)
  /Author (tempusername12346455)
  /Subject (PCRE 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}{A3A3A3}
\definecolor{LightBackground}{HTML}{F3F3F3}
\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{PCRE Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{tempusername12346455} via \textcolor{DarkBackground}{\uline{cheatography.com/170864/cs/35809/}}}
\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}tempusername12346455 \\
  \uline{cheatography.com/tempusername12346455} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 1st December, 2022.\\
   Updated 1st December, 2022.\\
   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*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Assertions}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{(?=...)} \tn 
% Row Count 1 (+ 1)
% Row 1
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% Row Count 2 (+ 1)
% Row 2
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% Row Count 3 (+ 1)
% Row 3
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% Row Count 4 (+ 1)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{(?(condition)...)} \tn 
% Row Count 5 (+ 1)
% Row 5
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\mymulticolumn{1}{x{5.377cm}}{(?(condition)...|...)} \tn 
% Row Count 6 (+ 1)
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\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} x{4.4793 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Anchors}}  \tn
% Row 0
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\textasciicircum{} & Start of string or line \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\$ & End of string, or end of line in multi-line pattern \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\textbackslash{}A & Start of string, ignores m flag \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
\textbackslash{}z & End of string, ignores m flag \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}Z & End of string or char before last new line, ignores m flag \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
\textbackslash{}b & Word boundary; position between a word character (\textbackslash{}w), and a nonword character (\textbackslash{}W) \tn 
% Row Count 10 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\textbackslash{}B & Not word boundary \tn 
% Row Count 11 (+ 1)
% Row 7
\SetRowColor{white}
\textbackslash{}G & End of the previous match or the start of the string for the first match \tn 
% Row Count 13 (+ 2)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} x{4.4793 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Flags or Modifiers}}  \tn
% Row 0
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g & Global match \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
i & Ignore case \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
m & Multiple lines (\textasciicircum{} and \$ match start and end of a line) \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
s & Single line (. matches newline) \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
x & Specifies that whitespace characters in the pattern are ignored except when escaped or inside a character class \tn 
% Row Count 9 (+ 4)
% Row 5
\SetRowColor{white}
J & Duplicate group names allowed \tn 
% Row Count 10 (+ 1)
% Row 6
\SetRowColor{LightBackground}
U & Ungreedy quantifiers \tn 
% Row Count 11 (+ 1)
% Row 7
\SetRowColor{white}
A & Anchored, the pattern is forced to match only at the beginning (\textasciicircum{}) \tn 
% Row Count 13 (+ 2)
% Row 8
\SetRowColor{LightBackground}
E & Anchored, the pattern is forced to match only at the end (\$) \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.54747 cm} x{4.42953 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Quantifiers}}  \tn
% Row 0
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a|b & a or b \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
+ & 1 or more \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
* & 0 or more \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
? & 0 or 1 \tn 
% Row Count 4 (+ 1)
% Row 4
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?? & 0 or 1, as few times as possible (lazy) \tn 
% Row Count 6 (+ 2)
% Row 5
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+? & 1 or more, as few times as possible (lazy) \tn 
% Row Count 8 (+ 2)
% Row 6
\SetRowColor{LightBackground}
*? & 0 or more, as few times as possible (lazy) \tn 
% Row Count 10 (+ 2)
% Row 7
\SetRowColor{white}
\{n\} & n times exactly \tn 
% Row Count 11 (+ 1)
% Row 8
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\{n,m\} & From n to m times \tn 
% Row Count 13 (+ 2)
% Row 9
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\{n,\} & At least n time \tn 
% Row Count 14 (+ 1)
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\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Lazy or Ungreedy means match the pattern the least times as possible. \newline Greedy means match the pattern the most times as possible. \newline Quantifiers (+, *) are greedy by default}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.14471 cm} x{3.83229 cm} }
\SetRowColor{DarkBackground}
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% Row 0
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(...) & Capturing \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
(?P\textless{}obj\textgreater{}...) & Capturing group named "obj" \tn 
% Row Count 3 (+ 2)
% Row 2
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(?P=obj) & Match the named group "obj" \tn 
% Row Count 4 (+ 1)
% Row 3
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% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}Y & Match the Y'th captured group \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
(?\textgreater{}...) & Atomic group: This group does not allow any backtracking to occur \tn 
% Row Count 10 (+ 3)
% Row 6
\SetRowColor{LightBackground}
(?|...) & Duplicate group numbers \tn 
% Row Count 11 (+ 1)
% Row 7
\SetRowColor{white}
(?\#...) & Comment between parenthesis \tn 
% Row Count 12 (+ 1)
% Row 8
\SetRowColor{LightBackground}
(?:...) & Matches but does not capture the group \tn 
% Row Count 14 (+ 2)
% Row 9
\SetRowColor{white}
(?\&obj) & Recurse into the named group "obj" \tn 
% Row Count 16 (+ 2)
% Row 10
\SetRowColor{LightBackground}
(?Y) & Recurse into numbered group Y \tn 
% Row Count 17 (+ 1)
% Row 11
\SetRowColor{white}
(?R) & Recurse into entire pattern \tn 
% Row Count 18 (+ 1)
% Row 12
\SetRowColor{LightBackground}
\textbackslash{}g\textless{}Z\textgreater{} & Recurse into the named or numbered group Z \tn 
% Row Count 20 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{0.84609 cm} x{4.13091 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Character Classes and Ranges}}  \tn
% Row 0
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. & Any character except new line (\textbackslash{}n) \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
{[}abc-f{]} & One character of: a, b, c, d, e, f \tn 
% Row Count 4 (+ 2)
% Row 2
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{[}\textasciicircum{}abc-f{]} & One character except: a, b, c, d, e, f \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\textbackslash{}d & One digit \tn 
% Row Count 7 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}D & One non-digit \tn 
% Row Count 8 (+ 1)
% Row 5
\SetRowColor{white}
\textbackslash{}s & One whitespace \tn 
% Row Count 9 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\textbackslash{}S & One non-whitespace \tn 
% Row Count 10 (+ 1)
% Row 7
\SetRowColor{white}
\textbackslash{}w & One word {[}a-zA-Z0-9\_{]} \tn 
% Row Count 11 (+ 1)
% Row 8
\SetRowColor{LightBackground}
\textbackslash{}W & One non-word {[}\textasciicircum{}a-zA-Z0-9\_{]} \tn 
% Row Count 12 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.74655 cm} x{4.23045 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Special Character Classes}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textbackslash{}\textbackslash{} & General Escape \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\textbackslash{}n & New line or line feed \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\textbackslash{}r & Carriage return (used to reset a device's position to the beginning of a line of text) \tn 
% Row Count 5 (+ 3)
% Row 3
\SetRowColor{white}
\textbackslash{}t & Tab \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}0 & Null character \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
\textbackslash{}xHH & Hexademical digit HH \tn 
% Row Count 8 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\textbackslash{}oOOO & Octal digit OOO \tn 
% Row Count 9 (+ 1)
% Row 7
\SetRowColor{white}
{[}\textbackslash{}b{]} & Backspace (yes it's inside brackets) \tn 
% Row Count 11 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\textbackslash{}f & Form feed (next page) \tn 
% Row Count 12 (+ 1)
% Row 9
\SetRowColor{white}
\textbackslash{}v & Vertical tab \tn 
% Row Count 13 (+ 1)
% Row 10
\SetRowColor{LightBackground}
\textbackslash{}Q...\textbackslash{}E & Remove special meaning from a sequence of characters \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.24425 cm} x{3.73275 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Posix Classes}}  \tn
% Row 0
\SetRowColor{LightBackground}
{[}:xdigit:{]} & Hexadecimal digits \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
{[}:upper:{]} & Uppercase letters \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
{[}:lower:{]} & Lowercase letters \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
{[}:alpha:{]} & Letters \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
{[}:alnum:{]} & Letters and digits \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
{[}:ascii:{]} & Ascii codes 0 - 127 \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
{[}:cntrl:{]} & Control characters \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
{[}:print:{]} & Visible characters \tn 
% Row Count 8 (+ 1)
% Row 8
\SetRowColor{LightBackground}
{[}:punct:{]} & Visible punctuation characters \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}