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POregex to replace '\\' by <br> but only outside some tags
 

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  1. POregex to replace '\\' by <br> but only outside some tags
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    <p>I am new to regex and have been struggling for a while on this one: I want to transform LaTeX files to HTML. </p> <p>I use mathjax to render equations and some javascript replace functions to convert the tags. I have nearly finished, but I still have an issue with the line breaks: I need to transform <code>\\</code> to <code>&lt;br&gt;</code>, but <strong>only</strong> outside the tags <code>\begin{array}</code> and <code>\end{array}</code>.</p> <p>Example: in this portion, only the <code>\\</code> before <code>Montrer l'equivalence</code> should be replaced.</p> <pre><code>$M=\left( \begin{array}{c|c} A &amp;B \\ \hline C &amp;D \\ \end{array} \right)$ $in$ $\mathcal{M}_{n}(\mathbb{K})$ avec $A$ $\in$ $\mathcal{M}_{r}(\mathbb{K})$ inversible.\\ Montrer l'equivalence: \[ \Bigl( rg(A) = rg(M) \Bigr) \Leftrightarrow \Bigl( D = CA^{-1}B \Bigr) \] \begin{enumerate} \item Calculer $detB$ en fontion de $A$. \item En déduire que $detB \geqslant 0$. \end{enumerate} $M= \left( \begin{array}{c|c} A &amp;B \\ \hline C &amp;D \\ \end{array} \right)$ </code></pre> <p>How can I do this with regex ?</p> <p>EDIT: I have found <a href="http://regexpal.com/?flags=g&amp;regex=&amp;input=Soit%20%0A%24M%3D%0A%5Cleft%28%0A%5Cbegin%7Barray%7D%7Bc%7Cc%7D%0AA%20%26B%20%5C%5C%20%5Chline%0AC%20%26D%20%5C%5C%20%0A%5Cend%7Barray%7D%0A%5Cright%29%24%0A%0A%24in%24%20%24%5Cmathcal%7BM%7D_%7Bn%7D%28%5Cmathbb%7BK%7D%29%24%20avec%20%24A%24%20%24%5Cin%24%20%24%5Cmathcal%7BM%7D_%7Br%7D%28%5Cmathbb%7BK%7D%29%24%20inversible.%5C%5C%20Montrer%20l%27equivalence%3A%0A%5C%5B%0A%5CBigl%28%20rg%28A%29%20%3D%20rg%28M%29%20%20%5CBigr%29%20%5CLeftrightarrow%20%5CBigl%28%20D%20%3D%20CA%5E%7B-1%7DB%20%5CBigr%29%0A%5C%5D%0A%0A%0A%5Cbegin%7Benumerate%7D%20%0A%5Citem%20Calculer%20%24detB%24%20en%20fontion%20de%20%24A%24.%20%0A%5Citem%20En%20d%C3%A9duire%20que%20%24detB%20%5Cgeqslant%200%24.%0A%5Cend%7Benumerate%7D%0A%0A%24M%3D%0A%5Cleft%28%0A%5Cbegin%7Barray%7D%7Bc%7Cc%7D%0AA%20%26B%20%5C%5C%20%5Chline%0AC%20%26D%20%5C%5C%20%0A%5Cend%7Barray%7D%0A%5Cright%29%24" rel="nofollow">here</a> a handy regex tester...</p>
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    1. CODo you use a language for that or an editor?
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      1. POregex to replace '\\' by <br> but only outside some tags
      1. USCasimir et Hippolyte
    2. COCompiling one language into another is not just about regular expressions. It is about lexical and grammatical analysis. The only thing i could suggest you is the use of [Lex & Yacc](http://epaperpress.com/lexandyacc/). But this is a huge topic.
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      1. POregex to replace '\\' by <br> but only outside some tags
      1. USPatryk Ziemkowski
    3. COSorry it's not clear, I'm not just starting to do this, I have nearly finished. I use a combination of javascript replace functions + mathjax to render equations. The `<br>` issue is the last issue I need to handle (at least, that's what I think!).
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      1. POregex to replace '\\' by <br> but only outside some tags
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