Re: Convert some Latex expressions in Emacs.

[Michael Heerdegen <michael_heerdegen@web.de>]

Hongyi Zhao <hongyi.zhao@gmail.com> writes:

> 1. Remove the following stuff: `\begin{array}{l}', `\end{array}'.
> 2. For each word, remove '{' and '}', spaces, and add * between two
> characters of it, i.e., `P^{5} Q^{2} R' should be changed to
> `P^5*Q^2*R'.
> [...]

If you have some time you might have a look at peg.el (from Gnu Elpa).
PEGs (Parsing Expression Grammars) are a bit more expressive than
regular expressions.  Takes a bit of time to get used to the concept but
if you have to solve such tasks more often it may pay off.

Michael.