[OS X TeX] Re: Find and replace with regular expressions

Art Werschulz agw at comcast.net
Mon Nov 19 18:23:36 CET 2007


On Nov 19, 2007, at 11:37 AM, Markus S wrote:

>> Indeed, my original response pointed out that very flaw, and  
>> others.   But I wanted to give an answer which would probably work  
>> for a lot of  the document, and if he wanted to (learn enough to)  
>> tweak the regex  he could, or just find the rest manually, he'd  
>> still save a lot of work.
>> Is there any regex that's going to work 100% of the time?.  How  
>> would  you fix the text
>> 	Acme sells widgets for \$5.00 a unit.  The cost to produce $x$   
>> widgets is $\$(2x-0.03 x^2)$.
> My poor man's way of doing is do a find all on '$'. Scan the list  
> if all equations have at least a space before the $ at the  
> beginning. If yes, do a find all for ' $', check again to see if  
> only equations in this list and then do replace all. Continue for  
> the end of the equations.
> Or, categorise all occurances of '$'. If they are only of the type \ 
> $ and $ equation $ then first replace \$ with something else that  
> is unique and use your regex. Finally, replace that unique string  
> with \$ again.

Yet another idea:  Use emacs, which has a query-replace-regexp  
command (which is normally bound to "C-M-%").  Type in a regexp that  
matches what you think describes your target, followed by its  
replacement text.  For each regexp instance found, emacs will ask  
whether you really want to do the replacement.

Art Werschulz
207 Stoughton Avenue, Cranford  NJ 07016-2838
(908) 272-1146

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