On 6/29/2004 9:58 PM, David Arnold wrote:
All,
Suppose I have a number of lines in a latex file like this:
\backans{If $x=y^{2n}$ and $z=y^{3n}_{11}$, then we can substitute to find a solution.}
I'd like to scan the file and replace all of these with this format:
\begin{answer} If $x=y^{2n}$ and $z=y^{3n}_{11}$, then we can substitute to find a solution. \end{answer}
I'm looking for suggestions as to how to make this change with my perl script. I am puzzled by the use of nested braces and how I can be sure I've got everything between the opening and closing brace.
You may want to take a look at Text::Balanced or Regexp::Common (the Regexp::Common::balanced subclass).
For this type of work though, I generally prefer the more straightforward method of walking thru the file one char at a time, counting opening braces and substracting closing braces until the count reaches zero. At that point you can take the appropriate action. For this task, I really don't believe regexs offer any advantage and are probably slower (I'm sure Japhy will correct me if I'm wrong here).
Randy.
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