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Re: Custom searches, like interactively searching palindromes

From: Andreas Röhler
Subject: Re: Custom searches, like interactively searching palindromes
Date: Fri, 01 Oct 2010 15:36:46 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; de; rv: Gecko/20100711 Thunderbird/3.0.6

Am 01.10.2010 11:50, schrieb Karan Bathla:


I would like to know how one can interactively search for patterns that are not 
captured by regexes, like palindromes.

One approach would be to use \, to embed a lisp function, like it's availabe in 
regex-replace. Is it easy to modify existing functions

 (or make new ones using the ones available) to do this?

With Emacs Lisp knowledge you can do this at a reasonable effort.
It's just for tasks like this, Emacs is the most perfect general tool IMHO.

The knowledge given, you may do the basics within minutes.
Finishing it will be some kind of tricky, as written language commonly is not so regular.

It depends how reliable your results must be, which language, the kind of texts etc.

Or maybe something like (check-for-pattern palindrome), where palindrome is a 
function that takes a string and returns true if that

string is palindrome. The function check-for-pattern does the search interactively feeding new string in the buffer to palindrome

and highlighting them if they match. The problem I am facing here is writing the check-for-pattern function using the existing

search functions.

Should you encounter that kind of tasks repeatedly, read the Emacs Lisp Doku, resp. the Intro first, if you are not a programmer.

Maybe some person here on this list don't know what to do some evening and writes it for you...

Good luck



Any other ways to do it ?


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