Question

How can I replace part of a string that has a potentially unknown starting index. For instance, if I had the following strings:

"<sometexthere width='200'>"
"<sometexthere tile='test' width='345'>"

I would be looking to replace the width attibute value that can have an unknown value and as mentioned before an unknown start index.

The I understand that I would somehow have to base this on the following part, which is constant, I just don’t quite understand how to achieve this.

width='

Answer 1

using System.Text.RegularExpressions;
Regex reg = new Regex(@"width='\d*'");
string newString = reg.Replace(oldString,"width='325'");

This will return a new string with a new width, provided you put a number between the ‘ ‘ in the new width field.