Notepad++ or PowerGrep regex to find, multiply and replace a price - regex

Question

I have an xml file that i need to find, multiply (e.g. by 1.25) and replace all prices.
Price tag looks like that:
<price><![CDATA[15.9]]></price>
The price tag should look like that after the operation:
<price><![CDATA[19.875]]></price>
Can this be done in Notepad++ or PowerGrep using a regular expression?
Thanks in advance.

Answer 1

As far as I know you can't use either program to preform the math but you can build a simple program in most any language of your choice to take a file use regex to find the number. Cast that string as a double do the math and put it back into the string. Later on today I could probably build something in c# but it should be relatively straight forward in most languages. You may even be able to build a shell script and use grep if you're not in a windows environment or use Powershell for windows but I have less experience with Powershell.
Edit: There is an easier way to do this http://msdn.microsoft.com/en-us/library/hcebdtae(v=vs.110).aspx
this is essentially what you want to do using the xmldocument object.
Edit2: I did this even though I couldn't get a hold of the original poster I thought someone might be able to use the info and I learned a lot. I can add the source code to github if anyone is interested.
public static void ChangePricesWork(string filepath, double multiply)
{
var document = new XmlDocument();
document.Load(filepath);
XmlNodeList nodeList = document.GetElementsByTagName("price");
foreach (XmlNode node in nodeList)
{
if (!string.IsNullOrEmpty(node.InnerText))
{
node.InnerText = Convert.ToString(multiplyPrice(multiply, node.InnerText));
}
}
string newFilePath = string.Format(#"{0}\{1}_updated.xml", Path.GetDirectoryName(filepath), Path.GetFileNameWithoutExtension(filepath));
document.Save(newFilePath);
}
private static double multiplyPrice(double multiply, string oldPrice)
{
var newPrice = new double();
if (Double.TryParse(oldPrice, out newPrice))
{
newPrice = newPrice * multiply;
}
return newPrice;
}

Answer 2

Notepad++ has a Pythonscript plugin that allows you to create quick Python scripts that have access to your document and Notepad++ itself.
The install and setup is described in this answer.
The API has moved on a little bit since then, you do a regular expression replace with Editor.rereplace now.
# Start a sequence of actions that is undone and redone as a unit. May be nested.
editor.beginUndoAction()
# multiply_price_cdata
from decimal import *
TWOPLACES = Decimal(10) ** -2
def multiply_price_cdata( m ):
price = Decimal( m.group(2) ) * Decimal( 1.25 )
return m.group(1) + str(price.quantize(TWOPLACES)) + m.group(3)
def cdata( m ):
return "CDATA"
# npp++ search/replace
re_price = r'(<price><!\[CDATA\[)(\d+\.\d+|\d+)(\]\]></price>)'
editor.rereplace( re_price , multiply_price_cdata )
# end the undo sequence
editor.endUndoAction()