From: Arup Rakshit <lists@...>
Date: 2013-01-19T01:01:41+09:00
Subject: How backtracking works in Ruby?

Hi,


What i am going to ask is very basic thing I know. But,as a newbie to
this platform,I am not getting the keen concept of backtracking in Regex
of Ruby. In such a case can any one help me to understand the core of
this concept by answering the following questions?

(a) What is backtracking?

(b) Why we need it?(means how regex with backtracking differs from a
regex without backtracking?)

(c) How it works when it is being used with any Regex? (It would be
great if it can be visualized with some code snippets to understand how
does it work)

(d) In what situation we have to think of it to use?


I used the link( http://ruby-doc.org/core-1.9.3/Regexp.html ) to get
it's core,but my bad i am not getting the answers of all my above
questions from here to have the concept.


Thanks in advance!

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