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Find surrounding text for match

Hello. Can you suggest the algorithm to search surrounding test.
I need to find specific word in document and get its rectangle, this quite easy task to do.
But next challenge is to show the context where this word was found. I need to show 2 words before the match and 4 words after the match. I was trying to use regular expression for it, but the problem is that as a result I get the match for entire regex expression and rectangle will have boundaries for this entire match. But I need to have boundaries to that specific “word” only. I unable to find how to use Regex capture groups( like I may do with the pure C# text search), seems Aspose doesn’t have that functionality. Can you help to achieve desired result?


Could you please attach the input PDF and expected output here for our reference? We will then provide you more information on it.