{catcodes} is about "category codes" — an integer number from 0–15 associated to each of the 256 character codes. The category codes indicate the role of a character.

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change catcode with tickets (business card print) and tables

changing the direction of the slash of the digit zero In this answer I learned how to change the direction of the slash through the digit 0 inside a texttt block. This works fine, except it doesn’t ...
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\makeatletter within a beamer frame: how?

Within a beamer frame (not outside) makeatletter (or \catcode\@=11`) does not work. \documentclass{beamer} \makeatletter \def\my@command{My at command} \def\myatcommand{\my@command} \makeatother ...
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How to allow curly braces in command option

I need to store an URL parameter like &path=weigth:5|color:orange|enc:okydHa}peAXOHi@jANv@A@kJJmFAiDJuAHmDXcBb@cC`@gC^_DV}CJaCF{APaBVkBdAyEf@qC`@{B\aDSwB with later reencoding to utf8 and passing ...
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Would I use \catcode, tokens, or look outside of tex for a markdown-like parser solution?

My use case: a LaTeX template for courseware designed in a beamer presentation style. The template I'm designing is company-specific and the specificity of the company's presentation guidelines limits ...