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I just learned about \detokenize, so this question is likely a naive one.

Nonetheless, based on what I thought that I understood about \detokenize, I would have expected \detokenize{_} to render as _.

However, when I compile the following MWE, \detokenize{_} renders as something that seems to be U+05C4 U+02D9 (see @Qrrbrbirlbel's comment).

\documentclass{article}

\begin{document}

A\detokenize{_}B

\end{document}

enter image description here

However, when I add \usepackage[T1]{fontenc} to the preamble, everything works as expected.

\documentclass{article}

\usepackage[T1]{fontenc}

\begin{document}

A\detokenize{_}B

\end{document}

enter image description here

What's going on here? My .tex file is UTF-8 encoded, and I'm compiling on a Mac (OS X 10.9.1) with TeXShop (v. 3.26) if any of that is relevant here.

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8
  • 3
    There’s no _ in the OT1 encoding. It is at position 0x5F (ASCII) in T1. At this position is ˙ in OT1.
    – Qrrbrbirlbel
    Dec 20, 2013 at 5:37
  • @Qrrbrbirlbel Ah, that would make sense. I take it OT1 font encoding is the default for LaTeX? I wasn't aware of that. Is that also true for XeLaTeX? At any rate, if you want to make this an answer, I'll happily accept it.
    – Adam Liter
    Dec 20, 2013 at 5:39
  • 1
    Normally one doesn't load a fontencoding manually with XeTeX. Using package fontspec is the standard, which loads en encoding called eu1, giving you a wider support. Frequently loaded packages: Differences between pdfLaTeX and XeLaTeX
    – Johannes_B
    Dec 20, 2013 at 8:27
  • 1
    \string_ is easier than \detokenize{_}, isn't it? But \_ is even easier (and works also with OT1).
    – egreg
    Dec 20, 2013 at 10:39
  • @egreg For me, \string_ still produces ˙ unless \usepackage[T1]{fontenc} is loaded. And \_ isn't an option in this case. (This question arose as a result of one of the answers to my question about DOIs and BibTeX.)
    – Adam Liter
    Dec 20, 2013 at 16:54

1 Answer 1

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5

As Qrrbrbirlbel points out in the comments, there is no _ in OT1 encoding, which is the default font encoding for LaTeX.

Yet, in T1 encoding, _ is at 5F:

enter image description here

Which is where ˙ is at in OT1 encoding:

enter image description here

Thus, without specifying the output font encoding to be T1 by declaring \usepackage[T1]{fontenc} in the preamble, the output will be ˙ instead of _.

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1
  • The code point is “5F”, not “5xF”. The ‘x’ is a placeholder in the column head.
    – gigabytes
    Dec 6, 2017 at 0:44

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