如何从字符串中提取特定文本。 困难的部分是所需的文本定期更改

Question

I have an HTML document which contains this text somewhere in it

function deleteFolder() {
        var mailbox = "CN=John Urban,OU=Sect-1,DC=TestServer ,DC=acme,DC=com";
        var path = "/Inbox/";

//string of interest: "CN=John Urban,OU=Sect-1,DC=TestServer ,DC=acme,DC=com"

I just want to extract this text and store it in a variable in C#. My problem is that string of interest will slightly change each time the page is loaded, something like this:

• "CN=John Urban,OU=Sect-1,DC=TestServer ,DC=acme,DC=com"
• "CN=Jane Doe,OU=Sect-1,DC=TestServer ,DC=acme,DC=com"
• etc....

How do I extract that ever changing string, without regular expression?

Answer 1

Is it always a function deleteFolder() which has its first line as var mailbox = "somestring" ? And you are interested in somestring ?

Based on the requirements you told us, could just search your string containing the HTML for var mailbox =" and then the next " and take all text between these two occurrences.

var htmlstring= "..."; //
var i1 = htmlstring.IndexOf("var mailbox = \"");
var i2 = i1 >= 0 ? htmlstring.IndexOf("\"", i1+15) : -1;
var result = i2 >= 0 ? htmlstring.Substring(i1+15, i2-(i1+15)): "not found";

VERY, VERY ugly, not maintainable, but without more information, I can't do any better. However Regex would be much nicer!