[OS X TeX] Find and replace with regular expressions
ejablow at cox.net
Mon Nov 19 13:44:16 EST 2007
---- Art Werschulz <agw at comcast.net> wrote:
> You'd need to make sure that the dollar signs aren't preceded by
> backslashes. So if you replace "$" by "[^\\]$" in the original
> regexp, you should be okay. Please note that I have not tested this
> out, and so it may need tweaking. Don't try this on your only copy
> of the file!!!
I'm sorry that I hadn't read the post I replied to fully. He did make the same point I did. The regex [^\\]\$ has a problem however; it never matches at the beginning of the searched text! Suppose you aren't using multi-line mode. Then, a $ at the beginning of a line isn't preceded by anything. Furthermore, the character before would have to be captured too so it could be replaced by itself. I'm guessing this Perlish regex would work:
(?<![^$\\]) # Search for an expression not preceded by a dollar sign or backslash,
[$] # Followed by a single $.
( # Capture the content
(?: # which we don't capture
[^$] | # consisting a non-dollar sign,
\\\$) # or an (escaped) backslash and an (escaped) $
+ # repeated at least once
) # Finish with the capture
[$] # Followed by the closing dollar sign
} xm # Free-form regex and multiline mode.
I prefer [$] to \$ because I don't have to esacpe any of the characters with backslashes.
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