Regex to find location of a recurring string

Greetings,
I have a long text file with some HTML formatting in it.  Within this file I need to find the start and end points of a particular string.  These strings were endnotes that somehow got seen as regular text when saved as PDF and now need to be removed.

The string I'm searching for starts with
<P>US-United States industry only.

and ends with
United States industries are comparable.</P>

The kicker is that the string may or may not have leading or trailing spaces within the <P> tags.  So what I want to do, is find the starting and ending locations of this string and remove the text between them
andy_eeAsked:
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andy_eeAuthor Commented:
I am aware of the indexof function.  My problem is that leading and trailing spaces *within* the paragraph tags.
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iHadiCommented:
Hi

What I understand from your question is that you have a text that looks like this:

<P>  US-United States industry only. text text United States industries are comparable.  </P>

and you want it like this:

<P>US-United States industry only. text text United States industries are comparable.</P>

to do so you can use the replace function of the Regex:

string input = "...";
string pattern = @"(?<start><P>)\s*(?<text>US-United States industry only\..*United States industries are comparable\.)\s*(?<end></P>)";
string replacement = @"${start}${text}${end}";
 
string result = Regex.Replace(input, pattern, replacement);
 
Console.WriteLine(result);

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andy_eeAuthor Commented:
You are *SO* close!

I want to find and remove a string that starts with:
"<P>US-United States industry only." or "<P> US-United States industry only."

and ends with:
"United States industries are comparable.</P>" or "United States industries are comparable. </P>"

Please note the spaces after the <P> tag and before the </P> tag.
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iHadiCommented:
The previous code does that exactly
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andy_eeAuthor Commented:
Excellent!  Thanks!
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