Re: how to use parsing expressing grammar

[Kevin Rodgers <kevin.d.rodgers@gmail.com>]

Xah Lee wrote:
> There are 2 parsing expression grammars in elisp.
> 
>     * http://www.emacswiki.org/cgi-bin/wiki/ParserCompiler, (2008) by
> Mike Mattie.
>     * http://www.emacswiki.org/emacs/ParsingExpressionGrammars (2008)
> by Helmut Eller.
> 
> The second one seems simpler, and i'm trying to learn it as a regex
> replacement, but don't know how to use it.
> 
> Could anyone give concrete example in the following scenario?
> 
> For example, on my website i have things like:
> 
>  <hr>
>  <p>Related essays:</p>
>  <ul>
>  <li><a href="someFilePath1">SomeTitleString2</a> someSring1</li>
>  <li><a href="someFilePath2">SomeTitleString2</a> someSring2</li>
>  ...
>  </ul>
> 
> Suppose i want to change them to:
> 
>  <hr>
>  <p>See also:</p>
>  <p>
>  <a href="someFilePath1">SomeTitleString1</a> someSring1<br>
>  <a href="someFilePath2">SomeTitleString2</a> someSring2<br>
>  ...
>  </p>
> 
> How do i do it?

Choose the right tool for the job:

sed -e 's|^<p>Related essays:</p>$|<p>See also:</p>|' -e 
'/^<ul>$/,/^<\/ul>/{s|^<\(/*\)ul>$|<\1p>|;s|^<li>||;s|</li>$|<br>|;}'

And since this is help-gnu-emacs@gnu.org:

C-x h
C-u M-| sed -e ...

-- 
Kevin Rodgers
Denver, Colorado, USA