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copied!<p>Debilski's post is definitely a solid way to do it, although the <code>\say</code> is not necessary. Here's a shorter way that makes use of some LaTeX internal shortcuts (<code>\@gobble</code> and <code>\@ifnextchar</code>):</p> <pre>\makeatletter \def\hyphenatestring#1{\xHyphen@te#1$\unskip} \def\xHyphen@te{\@ifnextchar${\@gobble}{\sw@p{\hskip 0pt plus 1pt\xHyphen@te}}} \def\sw@p#1#2{#2#1} \makeatother</pre> <p>Note the use of <code>\hskip 0pt plus 1pt</code> instead of <code>\discretionary</code> - when I tried your example I ended up with a ragged margin because there's no stretchability. The <code>\hskip</code> adds some stretchable glue in between each character (and the <code>\unskip</code> afterwards cancels the extra one we added). Also note the LaTeX style convention that "end user" macros are all lowercase, while internal macros have an <code>@</code> in them somewhere so that users don't accidentally call them.</p> <p>If you want to figure out how this works, <code>\@gobble</code> just eats whatever's in front of it (in this case the <code>$</code>, since that branch is only run when a <code>$</code> is the next char). The main point is that <code>\sw@p</code> is only given one argument in the "else" branch, so it swaps that argument with the next char (that isn't a <code>$</code>). We could just as well have written <code>\def\hyphenate#next#1{#1\hskip...\xHyphen@te}</code> and put that with no args in the "else" branch, but (in my opinion) <code>\sw@p</code> is more general (and I'm surprised it's not in standard LaTeX already).</p>

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