Question

I have the text

<column caption='TZ_Shift' datatype='real' name='[total_millis Parameter]' 
param-domain-type='any' role='measure' type='quantitative' 
value='-0.16666666699999999'>

which can also be like

<column caption='TZ_Shift' value='-0.16666666699999999'>

which gets repeated a several times and I want to replace the value part of it .

so I want the result to be something like this

<column caption='TZ_Shift' datatype='real' name='[total_millis Parameter]' 
param-domain-type='any' role='measure' type='quantitative' 
value='-0.73783'>

and

<column caption='TZ_Shift' value='-0.73783'>

respectively where 0.73783 is new val

I referred this question c# regex to find and replace reusing part of the matched text

But I am unable to understand the regex on the solution

can somebody help me out with regex .

Xml parsing should have been the best solution but I am unable to use xml parsing(for some reason).

Answer 1

If you only want to change the contents of every value attribute, then I would simply use
(<column[^>]* value=')([^']+)('[^>]*>) as pattern and replace it with $1-0.73783$3.

In C# this could be done as follows:

Regex re = new Regex("(<column[^>]* value=')([^']+)('[^>]*>)");  
string input = @"<column caption='TZ_Shift' value='-0.16666666699999999'>";
string output = re.Replace(input, "$1-0.73783$3");

(edit: extended regex to only match <column> elements)