Compare & Highlight Large Strings

taintedSoul

New Member
Joined
Mar 17, 2011
Messages
1
I am attempting to build an automated spider to compare two versions of the 'same' web page by extracting the HTML Source code of each URL (old & new). There should be no visual differences, but there may be some differences between hidden meta data and URLs, so I don't want to do a 1:1 comparison, but would like to somehow identify either the number of differences, or somehow skip the known differences (server names, domains, other minor changes, etc).

I have the code to store the HTML into string objects that are ready to compare:

Code:
strPage1 = GetPageHTML(strFullURL, intTimeout)
strPage 2 = GetPageHTML(strFullURL, intTimeout)

I would like to compare the differences between strPage1 and strPage2 but keep comparing after encountering the first difference and output the # of discrepancies to column (E) on my worksheet. Any ideas?

Example of strPage1:
Code:
<html>
<head>
< meta name="server" content="server01">
< meta name="domain" content="google.com">
< meta type="text/javascript" src="http://google.com/file1.js"></script>
</head>
<body>
<p><a href="http://google.com/searchResults/test.html">Test URL</a></p>
</body>
</html>

Example of strPage2:

Code:
<html>
<head>
< meta name="server" content="server02">
< meta name="domain" content="bing.com">
< meta type="text/javascript" src="http://bing.com/file1.js"></script>
</head>
<body>
<p><a href="http://bing.com/searchResults/test.html">Test URL</a></p>
</body>
</html>

I would want this to either return "4" for 4 differences, or somehow highlight the various differences, or even a % of how different the two strings are from each other.

I wasn't able to find anything similar to this by simply googling, but if there is something already out there I apologize.

Thanks in advance for any advice! Other suggestions for automating this same type of thing are definitely welcome.
 

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Tom Urtis

MrExcel MVP
Joined
Feb 10, 2002
Messages
11,224
This seems like a good candidate for conditional formatting. If you copy and paste your first sample code strpage1 into an Excel sheet, it would occupy 10 rows. I know it's only an example, but let's say it occupies a hundred rows or a thousand rows, or ten thousand rows. Whatever the case, skip a few lines and paste in the next (strPage2) block of code. Conditionally format the first cell if the second (strpage2) code with the formula rule =A10002 < > A1, and select a format color to identify the cells where differences lie. Copy cell A10002 and paste special for formats to the rest of the strPage2 used range. I used cell 10002 in the hypothetical example of your first strPage1 code being then thousand rows.

Maybe I am missing something obvious but that's my first impression of a way to go about obtaining the result you seem to be asking for.
 

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