\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{Nikolay Mishin (mishin)}
\pdfinfo{
  /Title (perl-regexp.pdf)
  /Creator (Cheatography)
  /Author (Nikolay Mishin (mishin))
  /Subject (perl regexp 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}{A77AFF}
\definecolor{LightBackground}{HTML}{F4EEFF}
\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{perl regexp Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Nikolay Mishin (mishin)} via \textcolor{DarkBackground}{\uline{cheatography.com/1008/cs/418/}}}
\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}Nikolay Mishin (mishin) \\
  \uline{cheatography.com/mishin} \\
        \uline{\seqsplit{mishin}.narod.ru}
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 12th May, 2016.\\
   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{0.9954 cm} x{3.9816 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{20. Regular expression special variable}}  \tn
% Row 0
\SetRowColor{LightBackground}
\$1, \$2, \$3 & hold the backreferences \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\$+ & holds the last (highest-numbered) backreference \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\$\& & (dollar ampersand) holds the entire regex match \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\$' & (dollar followed by an apostrophe or single quote) holds the part of the string after (to the right of) the regex matc \tn 
% Row Count 10 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\$` & (dollar backtick) holds the part of the string before (to the left of) the regex match \tn 
% Row Count 13 (+ 3)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Using these variables is not recommended in perl scripts when performance matters, as it causes Perl to slow down all regex matches in your entire perl script.}}} \tn 
% Row Count 17 (+ 4)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\emph{All these variables are read-only, and persist until the next regex match is attempted.}}} \tn 
% Row Count 19 (+ 2)
% Row 7
\SetRowColor{white}
 & \$string = "This is the geek stuff article for perl learner"; \tn 
% Row Count 21 (+ 2)
% Row 8
\SetRowColor{LightBackground}
 & \$string =\textasciitilde{} /the (g.{\emph{) stuff(.}}) /; \tn 
% Row Count 23 (+ 2)
% Row 9
\SetRowColor{white}
 & print "Matched String=\textgreater{}\$\&\textbackslash{}nBefore Match=\textgreater{}\$`\textbackslash{}nAfter Match=\textgreater{}\$'\textbackslash{}nLast Paren=\textgreater{}\$+\textbackslash{}nFirst Paren=\textgreater{}\$1\textbackslash{}n"; \tn 
% Row Count 27 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Debugging regexp}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{use re 'taint';                 \newline % Row Count 1 (+ 1)
\# Contents of \$match are tainted if \$dirty was also tainted. \newline % Row Count 3 (+ 2)
(\$match) = (\$dirty =\textasciitilde{} /\textasciicircum{}(.*)\$/s);  \newline % Row Count 4 (+ 1)
\# Allow code interpolation: \newline % Row Count 5 (+ 1)
use re 'eval'; \newline % Row Count 6 (+ 1)
\$pat = '(?\{ \$var = 1 \})';      \# embedded code execution \newline % Row Count 8 (+ 2)
/alpha\$\{pat\}omega/;            \# won't fail unless under -T \newline % Row Count 10 (+ 2)
                               \# and \$pat is tainted \newline % Row Count 12 (+ 2)
use re 'debug';                \# like "perl -Dr" \newline % Row Count 13 (+ 1)
/\textasciicircum{}(.*)\$/s;                     \# output debugging info during \newline % Row Count 15 (+ 2)
                               \#     compile time and run time \newline % Row Count 17 (+ 2)
use re 'debugcolor';           \# same as 'debug',  \newline % Row Count 19 (+ 2)
                               \#    but with colored output% Row Count 21 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\columnbreak
\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{6 Regular Expressions}}  \tn
% Row 0
\SetRowColor{LightBackground}
(\$var =\textasciitilde{} /re/), (\$var !\textasciitilde{} /re/) & matches / does not match \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{m/pattern/igmsoxc} & matching pattern \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
qr/pattern/imsox & store regex in variable \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{s/pattern/replacement/igmsoxe} & search and replace \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Modifiers:}}} \tn 
% Row Count 8 (+ 1)
% Row 5
\SetRowColor{white}
i case-insensitive & o	compile once \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
g	global & x	extended \tn 
% Row Count 11 (+ 1)
% Row 7
\SetRowColor{white}
s	as single line (. matches \textbackslash{}n) & e	evaluate replacement \tn 
% Row Count 13 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Syntax:}}} \tn 
% Row Count 14 (+ 1)
% Row 9
\SetRowColor{white}
\textbackslash{} & escape \tn 
% Row Count 15 (+ 1)
% Row 10
\SetRowColor{LightBackground}
. & any single char \tn 
% Row Count 16 (+ 1)
% Row 11
\SetRowColor{white}
\textasciicircum{} & start of line \tn 
% Row Count 17 (+ 1)
% Row 12
\SetRowColor{LightBackground}
\$ & end of line \tn 
% Row Count 18 (+ 1)
% Row 13
\SetRowColor{white}
{\emph{, }}? & 0 or more times (greedy / nongreedy) \tn 
% Row Count 20 (+ 2)
% Row 14
\SetRowColor{LightBackground}
+, +? & 1 or more times (greedy / nongreedy) \tn 
% Row Count 22 (+ 2)
% Row 15
\SetRowColor{white}
?, ?? & 0 or 1 times (greedy / nongreedy) \tn 
% Row Count 24 (+ 2)
% Row 16
\SetRowColor{LightBackground}
\textbackslash{}b, \textbackslash{}B & word boundary ( \textbackslash{}w - \textbackslash{}W) / match except at w.b. \tn 
% Row Count 27 (+ 3)
% Row 17
\SetRowColor{white}
\textbackslash{}A & string start (with /m) \tn 
% Row Count 28 (+ 1)
% Row 18
\SetRowColor{LightBackground}
\textbackslash{}Z & string end (before \textbackslash{}n) \tn 
% Row Count 29 (+ 1)
% Row 19
\SetRowColor{white}
\textbackslash{}z & absolute string end \tn 
% Row Count 30 (+ 1)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{6 Regular Expressions (cont)}}  \tn
% Row 20
\SetRowColor{LightBackground}
\textbackslash{}G & continue from previous m//g \tn 
% Row Count 2 (+ 2)
% Row 21
\SetRowColor{white}
{[}...{]} & character set \tn 
% Row Count 3 (+ 1)
% Row 22
\SetRowColor{LightBackground}
(...) & group, capture to \$1, \$2 \tn 
% Row Count 5 (+ 2)
% Row 23
\SetRowColor{white}
(?:...) & group without capturing \tn 
% Row Count 7 (+ 2)
% Row 24
\SetRowColor{LightBackground}
\{n,m\} , \{n,m\}? & at least n times, at most m times \tn 
% Row Count 9 (+ 2)
% Row 25
\SetRowColor{white}
\{n,\}  , \{n,\}? & at least n times \tn 
% Row Count 10 (+ 1)
% Row 26
\SetRowColor{LightBackground}
\{n\}   , \{n\}? & exactly n times \tn 
% Row Count 11 (+ 1)
% Row 27
\SetRowColor{white}
| & or \tn 
% Row Count 12 (+ 1)
% Row 28
\SetRowColor{LightBackground}
\textbackslash{}1, \textbackslash{}2 & text from nth group (\$1, ...) \tn 
% Row Count 14 (+ 2)
% Row 29
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Escape Sequences:}}} \tn 
% Row Count 15 (+ 1)
% Row 30
\SetRowColor{LightBackground}
\textbackslash{}a	alarm (beep) & \textbackslash{}e	escape \tn 
% Row Count 16 (+ 1)
% Row 31
\SetRowColor{white}
\textbackslash{}f	formfeed & \textbackslash{}n	newline \tn 
% Row Count 17 (+ 1)
% Row 32
\SetRowColor{LightBackground}
\textbackslash{}r	carriage return & \textbackslash{}t	tab \tn 
% Row Count 19 (+ 2)
% Row 33
\SetRowColor{white}
\textbackslash{}cx	control-x & \textbackslash{}l	lowercase next char \tn 
% Row Count 20 (+ 1)
% Row 34
\SetRowColor{LightBackground}
\textbackslash{}L	lowercase until \textbackslash{}E & \textbackslash{}U	uppercase until \textbackslash{}E \tn 
% Row Count 22 (+ 2)
% Row 35
\SetRowColor{white}
\textbackslash{}Q	diable metachars until \textbackslash{}E & \textbackslash{}E	end case modifications \tn 
% Row Count 24 (+ 2)
% Row 36
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Character Classes:}}} \tn 
% Row Count 25 (+ 1)
% Row 37
\SetRowColor{white}
{[}amy{]} & 'a', 'm', or 'y' \tn 
% Row Count 26 (+ 1)
% Row 38
\SetRowColor{LightBackground}
{[}f-j.-{]} & range f-j, dot, and dash \tn 
% Row Count 28 (+ 2)
% Row 39
\SetRowColor{white}
{[}\textasciicircum{}f-j{]} & everything except range f-j \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{6 Regular Expressions (cont)}}  \tn
% Row 40
\SetRowColor{LightBackground}
\textbackslash{}d, \textbackslash{}D & digit {[}0-9{]} / non-digit \tn 
% Row Count 2 (+ 2)
% Row 41
\SetRowColor{white}
\textbackslash{}w, \textbackslash{}W & word char {[}a-zA-Z0-9\_{]} / non-word char \tn 
% Row Count 4 (+ 2)
% Row 42
\SetRowColor{LightBackground}
\textbackslash{}s, \textbackslash{}S & whitepace {[} \textbackslash{}t\textbackslash{}n\textbackslash{}r\textbackslash{}f{]} / non-space \tn 
% Row Count 6 (+ 2)
% Row 43
\SetRowColor{white}
\textbackslash{}C & match a byte \tn 
% Row Count 7 (+ 1)
% Row 44
\SetRowColor{LightBackground}
\textbackslash{}pP, \textbackslash{}PP & match p-named unicode / non-p-named-unicode \tn 
% Row Count 9 (+ 2)
% Row 45
\SetRowColor{white}
\textbackslash{}p\{...\}, \textbackslash{}P\{...\} & match long-named unicode / non-named-unicode \tn 
% Row Count 11 (+ 2)
% Row 46
\SetRowColor{LightBackground}
\textbackslash{}X & match extended unicode \tn 
% Row Count 12 (+ 1)
% Row 47
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Posix:}}} \tn 
% Row Count 13 (+ 1)
% Row 48
\SetRowColor{LightBackground}
{[}:alnum:{]} & alphanumeric \tn 
% Row Count 14 (+ 1)
% Row 49
\SetRowColor{white}
{[}:alpha:{]} & alphabetic \tn 
% Row Count 15 (+ 1)
% Row 50
\SetRowColor{LightBackground}
{[}:ascii:{]} & any ASCII char \tn 
% Row Count 16 (+ 1)
% Row 51
\SetRowColor{white}
{[}:blank:{]} & whitespace {[} \textbackslash{}t{]} \tn 
% Row Count 17 (+ 1)
% Row 52
\SetRowColor{LightBackground}
{[}:cntrl:{]} & control characters \tn 
% Row Count 18 (+ 1)
% Row 53
\SetRowColor{white}
{[}:digit:{]} & digits \tn 
% Row Count 19 (+ 1)
% Row 54
\SetRowColor{LightBackground}
{[}:graph:{]} & alphanum + punctuation \tn 
% Row Count 20 (+ 1)
% Row 55
\SetRowColor{white}
{[}:lower:{]} & lowercase chars \tn 
% Row Count 21 (+ 1)
% Row 56
\SetRowColor{LightBackground}
{[}:print:{]} & alphanum, punct, space \tn 
% Row Count 22 (+ 1)
% Row 57
\SetRowColor{white}
{[}:punct:{]} & punctuation \tn 
% Row Count 23 (+ 1)
% Row 58
\SetRowColor{LightBackground}
{[}:space:{]} & whitespace {[}\textbackslash{}s\textbackslash{}ck{]} \tn 
% Row Count 24 (+ 1)
% Row 59
\SetRowColor{white}
{[}:upper:{]} & uppercase chars \tn 
% Row Count 25 (+ 1)
% Row 60
\SetRowColor{LightBackground}
{[}:word:{]} & alphanum + '\_' \tn 
% Row Count 26 (+ 1)
% Row 61
\SetRowColor{white}
{[}:xdigit:{]} & hex digit \tn 
% Row Count 27 (+ 1)
% Row 62
\SetRowColor{LightBackground}
{[}:\textasciicircum{}digit:{]} & non-digit \tn 
% Row Count 28 (+ 1)
% Row 63
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Extended Constructs}}} \tn 
% Row Count 29 (+ 1)
% Row 64
\SetRowColor{LightBackground}
(?\#text) & comment \tn 
% Row Count 30 (+ 1)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{6 Regular Expressions (cont)}}  \tn
% Row 65
\SetRowColor{LightBackground}
(?imxs-imsx:...) & enable or disable option \tn 
% Row Count 2 (+ 2)
% Row 66
\SetRowColor{white}
(?=...), (?!...) & positive / negative look-ahead \tn 
% Row Count 4 (+ 2)
% Row 67
\SetRowColor{LightBackground}
(?\textless{}=..), (?\textless{}!..) & positive / negative look-behind \tn 
% Row Count 6 (+ 2)
% Row 68
\SetRowColor{white}
(?\textgreater{}...) & prohibit backtracking \tn 
% Row Count 7 (+ 1)
% Row 69
\SetRowColor{LightBackground}
(?\{ code \}) & embedded code \tn 
% Row Count 8 (+ 1)
% Row 70
\SetRowColor{white}
(??\{ code \}) & dynamic regex \tn 
% Row Count 9 (+ 1)
% Row 71
\SetRowColor{LightBackground}
(?(cond)yes|no) & condition corresponding to captured parentheses \tn 
% Row Count 12 (+ 3)
% Row 72
\SetRowColor{white}
(?(cond)yes) & condition corresponding to look-around \tn 
% Row Count 14 (+ 2)
% Row 73
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Variables}}} \tn 
% Row Count 15 (+ 1)
% Row 74
\SetRowColor{white}
\$\& & entire matched string \tn 
% Row Count 16 (+ 1)
% Row 75
\SetRowColor{LightBackground}
\$` & everything prior to matched string \tn 
% Row Count 18 (+ 2)
% Row 76
\SetRowColor{white}
\$' & everything after matched string \tn 
% Row Count 20 (+ 2)
% Row 77
\SetRowColor{LightBackground}
\$1, \$2 ... & n-th captured expression \tn 
% Row Count 22 (+ 2)
% Row 78
\SetRowColor{white}
\$+ & last parenthesis pattern match \tn 
% Row Count 24 (+ 2)
% Row 79
\SetRowColor{LightBackground}
\$\textasciicircum{}N & most recently closed capt. \tn 
% Row Count 26 (+ 2)
% Row 80
\SetRowColor{white}
\$\textasciicircum{}R & result of last (?\{...\}) \tn 
% Row Count 28 (+ 2)
% Row 81
\SetRowColor{LightBackground}
@-, @+ & offsets of starts / ends of groups \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{6 Regular Expressions (cont)}}  \tn
% Row 82
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{\seqsplit{http://perldoc.perl.org/perlrequick.html}} \tn 
% Row Count 1 (+ 1)
% Row 83
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{\seqsplit{http://habrahabr.ru/post/17126/}} \tn 
% Row Count 2 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.9954 cm} x{3.9816 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{REGEX METACHARS}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textasciicircum{} & string begin \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\$ & str. end (before \textbackslash{}n) \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
+ & one or more \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
* & zero or more \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
? & zero or one \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\{3,7\} & repeat in range \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
() & capture \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
(?:) & no capture \tn 
% Row Count 8 (+ 1)
% Row 8
\SetRowColor{LightBackground}
{[}{]} & character class \tn 
% Row Count 9 (+ 1)
% Row 9
\SetRowColor{white}
| & alternation \tn 
% Row Count 10 (+ 1)
% Row 10
\SetRowColor{LightBackground}
\textbackslash{}b & word boundary \tn 
% Row Count 11 (+ 1)
% Row 11
\SetRowColor{white}
\textbackslash{}z & string end \tn 
% Row Count 12 (+ 1)
% Row 12
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{\seqsplit{http://perldoc.perl.org/perlre.html}} \tn 
% Row Count 13 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\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}{REGEX MODIFIERS}}  \tn
% Row 0
\SetRowColor{LightBackground}
/i & case insens. \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
/m & line based \textasciicircum{}\$ \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
/s & . includes \textbackslash{}n \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
/x & ign. wh.space \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
/g & global \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\textbackslash{}Q & quote (disable) pattern metacharacters till \textbackslash{}E \tn 
% Row Count 7 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\textbackslash{}E & end either case modification or quoted section, think vi \tn 
% Row Count 9 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.38896 cm} x{2.58804 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{REGEX CHARCLASSES}}  \tn
% Row 0
\SetRowColor{LightBackground}
. & {[}\textasciicircum{}\textbackslash{}n{]} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\textbackslash{}s & {[}\textbackslash{}x20\textbackslash{}f\textbackslash{}t\textbackslash{}r\textbackslash{}n{]} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\textbackslash{}w & {[}A-Za-z0-9\_{]} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\textbackslash{}d & {[}0-9{]} \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\textbackslash{}S, \textbackslash{}W and \textbackslash{}D & negate \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}