enter image description here

Wanted output: no special effect of underscores.

How can you disable the current function of underscores?

  • 4
    Although there's a way to do it, it's not recommended. Can't you just load the url package, and wrap URLs in \url{...}? That will work. – Alan Munn May 14 '16 at 18:10
  • 1
    @AlanMunn I suspect this is connected to .tex Notes for Overview with Inline Comments for Non-LaTeX Users? – Torbjørn T. May 14 '16 at 18:11
  • @AlanMunn I really would like to disable it. I cannot use it \url{...} in all environments. So I really need it. Tor's pointed out thread is one example where I will have problems with % http://.... – Léo Léopold Hertz 준영 May 14 '16 at 18:12
  • Load the underscore package then. That should probably do the trick. You need to make sure you're using a font encoding (minimally T1 if using pdflatex) that supports the _ character. But you'll also have to escape things like # too. – Alan Munn May 14 '16 at 18:14
  • @Masi Ever heard of \urldef from the package url? It can be used in all environments. Problem solved. Simply do what you're supposed to do and do not re-invent America. – yo' May 14 '16 at 21:08

will make _ a normal punctuation character.

You will need


as OT1 encoded fonts don't have a _ in the ASCII slot.

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  • 1
    How can you disable hastag (#)? I tried unsuccessfully \catcode `#_=11. How did you know which number you can use for the mapping? – Léo Léopold Hertz 준영 May 14 '16 at 19:36
  • @Masi you don't want a _ in the # version:-) just replace _ by # in the above any tex tutorial will tell you the catcodes 11 is letter 12 is punctuation 13 is active – David Carlisle May 14 '16 at 20:38
  • @Masi 12, presumably, like _ – David Carlisle May 14 '16 at 20:40
  • @Masi you did something wrong then – David Carlisle May 14 '16 at 20:44
  • @Masi it works as described. You must have made an error somewhere – David Carlisle May 14 '16 at 21:00

Well, I can do this with url's \urldef:



\urldef \myCuteLittleURL \url|http://whatever/under_score#hash%percent|


Here I use the URL and have a comment at the very same place:
\myCuteLittleURL % http://whatever/under_score#hash%percent


enter image description here

I'm lost with your point about comments, so I included a comment.

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  • Yes, one option. I will see how the changed catcodes will behave. If they fail, then I think this is a very good option. – Léo Léopold Hertz 준영 May 14 '16 at 21:25
  • 2
    They of course fail badly, once you have %s in your urls. – yo' May 14 '16 at 21:26
  • How can you solve the problem with comment signs inside urls? – Léo Léopold Hertz 준영 May 14 '16 at 21:29
  • 2
    @Masi As you see, I solved it. My url contains a %. Now I'm off, good night. – yo' May 14 '16 at 21:29
  • I think it is not necessary to have percentage signs in links because you can always expand them before having them in your document. I however created a test case about this problem (test case 8 here tex.stackexchange.com/q/309541/13173) for the future work. – Léo Léopold Hertz 준영 May 14 '16 at 21:54

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