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I'm pretty new to regular expressions (oh no, a noob!)
Before you all run in the other direction :) may I please ask:

I have a list of URL's:

taxidrivermovie.com<br />
federalhousingtaxcredit.com<br />
nystax.gov<br />
tax-spot.com<br />
turbotax.com<br />
taxexemptworld.com<br />
taxidermy.net<br />
libertytax.com<br />
taxsalelists.com<br />
acttax.com

and wish to remove (replace with null) those containing the string 'taxi' to give:

federalhousingtaxcredit.com<br />
nystax.gov<br />
tax-spot.com<br />
turbotax.com<br />
taxexemptworld.com<br />
libertytax.com<br />
taxsalelists.com<br />
acttax.com

how can I achieve this using regex please?

Posted 20-Dec-10 10:21am

Graham Nichols

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Andreas Gieriet 20-Dec-10 17:55pm

Graham,
Please tell what you did try out so far. Where do you want to execute the Regex? In C#, Perl, ...? Do you have a sample program to show where you get stuck?
Cheers
Andi

Dr.Walt Fair, PE 20-Dec-10 18:26pm

If you are using .NET and by 'list' you mean a List<> then you can probably iterate through the list and delete the one where Contains("taxi") is true. Without knowing more, it's pretty hard to give a better answer.

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**JF2015** · Answer 1 · 2010-12-20T18:16:00

Here is some code in C# that does not use regular expressions, but solves the problem:

C#

List<string> lstTaxi = new List<string>();
lstTaxi.Add("taxidrivermovie.com");
lstTaxi.Add("federalhousingtaxcredit.com");
lstTaxi.Add("nystax.com");
lstTaxi.Add("tax-spot.com");
lstTaxi.Add("turbotax.com");
lstTaxi.Add("taxexemptworld.com");
lstTaxi.Add("taxidermy.com");
lstTaxi.Add("libertytax.com");
lstTaxi.Add("taxsalelists.com");
lstTaxi.Add("acttax.com");

List<string> lstWithoutTaxi = new List<string>();
foreach (string str in lstTaxi)
{
    if (!str.ToUpper().Contains("TAXI"))
        lstWithoutTaxi.Add(str);
}

I hope it helps.

AspDotNetDev · Answer 2 · 2010-12-20T18:29:00

Use this regular expression (not tested, so not sure if it works):

((?!\r|\n).)*taxi((?!\r|\n).)*(\r\n|$)

And replace all found occurrances with an empty string. You could also makes some tweaks if they are important to you (e.g., handle newlines better, and make sure there are no trailing newlines).

Graham Nichols · Answer 3 · 2010-12-21T04:48:00

Solution 3

I have it working now.

MANY thanks to everyone who replied - much appreciated guys.

Posted 21-Dec-10 4:48am

Graham Nichols

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