From: Sebastian Hungerecker <sepp2k@...>
Date: 2008-11-17T05:13:52+09:00
Subject: Re: gsub and reg expressions

Stuart Clarke wrote:
> I can assure you the only way I have been able to get this is by
> #{event.description[/Logon Type\:\t2/]}

Yes, but that's not an array. That's a method call to String#[]. This has 
nothing to do with what you're trying to do with gsub.


> If I change the expression to #{event.description(/Logon Type\:\t2/)}.
> It doesn't work (I dont no why, guess its something to do with library).

That doesn't work because you're trying to pass the regexp as an argument to 
description and I assume that description wasn't defined to take any 
arguments.

> To clarify I want to find Logon Type: 2 in the data set and change it to
> Local logon.

string.gsub(/regex/, "replacement") will find each part of string that 
matches /regex/ and then replace those parts (and only those) with
"replacement". The rest of the string will not be affected.
That's exactly what you want, as far as I can tell, so just remove those 
brackets.


> Hope this helps, I do understand what you are saying with the reg
> expressions but, all i can tell you is it works.

Well, obviously it doesn't or you wouldn't be here.
String#[] let's you get a substring. gsub allows you to replace substrings. 
[]s don't appear anywhere in the call to gsub except as part of the regex.

HTH,
Sebastian
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