[Tex/LaTex] pkgloader is not finding l3regex

l3regex

I would like to try a package which seems interesting, but it some dependencies are not satisfied.

Here is my minimal example:

\documentclass{article}

\usepackage{pkgloader}
\LoadPackagesNow

\begin{document}
    pckloader trial
\end{document}

And I get the following error: ! LaTeX Error: File 'l3regex.sty' not found.. Therefore, I tried to update my distribution with the linux commands

tlmgr update --self
tlmgr update --all

But the package l3regex is still not foundable. Plus, my computer is not lying since l3regex.sty is not in my folder /texmf-dist/tex/latex/*.

So, is it something normal ? How can I workaround this problem ?

Best Answer

Stand-alone l3regex was folded into the expl3 core some time ago. We've now withdrawn the 'stub' l3regex.sty file, so pkgloader needs to be updated. For the present, you could add

\usepackage{expl3}
\expandafter\def\csname ver@l3regex.sty\endcsname{}

before trying to load pkgloader to 'fool it' into thinking l3regex is loaded as a separate file.

Related Solutions

[Tex/LaTex] Defining a find and replace algorithm using LaTeX3’s l3regex

The following produces the result you are looking for:

\documentclass{article}
\usepackage{expl3}
\ExplSyntaxOn
\tl_new:N \l_demo_tl
\cs_new:Npn \demo #1 {
    \tl_set:Nn \l_demo_tl {#1}
    \regex_replace_all:nnN { \_(.*?)\_ } { \c{emph}\cB\{ \1 \cE\} } \l_demo_tl
    \tl_use:N \l_demo_tl
}
\ExplSyntaxOff
\begin{document}

\demo{This is a _test_ document.}

\end{document}

In the matching expression we have

\_ giving the underscore character
(...) providing a group of characters that are to be remembered and used as \1 in the replacement text
.*? which matches (lazily) at zero or more occurrances of any character

In the replacement text

\c{...} provides a control sequence, so
\c{emph} is your emphasise command
\cB\{ produces the { character with the class of an opening token, for the beginning of the argument to your emphasise command
\cE\} ends the argument group.

In regular expressions and their replacements \ introduces a number of special constructions with non-standard meanings. The documentation gives some good examples.

As egreg points out, escaping _ is not strictly necessary, but the documentation recommends it, saying:

non-alphanumeric printable ascii characters can (and should) always be escaped

Note that, following egreg's kind remarks, in the code above, the variable \l_demo was renamed in the above code to \l_demo_tl in compliance with LaTeX3 syntax conventions; the _tl indicates this holds a token list. Also, the declaration of the variable is only needed once, so this is moved out of the control sequence.

[Tex/LaTex] l3regex usage throws __scan_new:N error

The file versions in the question:

Package: l3tl-analysis 2011/12/08 v3039 L3 Experimental token lists analysis
Package: l3str 2013/04/24 v4482 L3 Experimental strings

are both 'matching' (there should be no issues with this combination). Thus the problem must lie elsewhere. As \__scan_new:N is not defined I think you have an older version of l3kernel installed which pre-dates the introduction of the 'scan mark' approach. Thus the solution will be to check your .log file carefully for where expl3 and the various component packages are loaded. They should all come from the same tree.

Best Answer

Related Solutions

[Tex/LaTex] Defining a find and replace algorithm using LaTeX3’s l3regex

[Tex/LaTex] l3regex usage throws __scan_new:N error

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