[OS X TeX] Find and replace with regular expressions

Eric Jablow ejablow at cox.net
Mon Nov 19 08:39:33 EST 2007

On Nov 19, 2007, at 8:18 AM, Matthew Leingang wrote:

> On Nov 19, 2007, at 7:20 AM, Alessandro Andretta wrote:
>> I would like to replace the $ signs in a LaTeX file with \( and \)
>> thus I would have to search for $...$ and replace it with \( ... \)
>> where ... is any string of symbols (letters, numbers, \ , {} &,etc)
>> EXCEPT $. I tried the help menu of TeXShop, TextMate, Textwrangler,
>> but their general treatment seems be a bit too technical for my  
>> taste.
>> Is there a simple way to archive this with any of the editors above?
> Dear Alessandro,
> Good question.  You need a more advanced search-and-replace  
> capability that looks at the context, not just the string itself.   
> This is what regular expressions [1] are for.
> TeXShop has regular expression support built in.  So you can open up  
> a find window,
> put this in the search box
> 	\$([^$]+)\$
> and this in the replace box
> 	\\(\1\\)
> make sure you click "Regular Expressions," and go.

This has some flaws.  You need negative look-behind assertions in the  
search, because you don't want to pick up the \$ of

     Acme sells widgets for \$5.00 a unit. The cost to produce $x$  
widgets is $2x-0.03 x^2$ dollars.

Different regex engines have different ways of handling such assertions.

Eric Jablow

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