Extract and concatenate to single string 2 or 3 or 4.. text elements in a pdf, by regex and proximity

I need .NET code to highlight (and extract and concatenate) 2 or 3 or 4 separate text elements in a pdf, based on regular expressions and their proximity to each other (see attached image). 1.) I am using the DevExpress PdfDocumentProcessor to obtain the document text and coordinates using the [login to view URL] property 2.) Then, use the standard Regex class to get all substrings in the given string (the text returned with the [login to view URL] property) that matches your regular expression. Example text in Pdf: 240 TT 12345 Example Regex (should find the elements above individually): 1st Line: 3 Numeric Chars: ^\d{3}$ 2nd Line: 2 Alpha Chars: ^[A-Z]{2}$ 3rd Line: 5 Numeric Chars: ^\d{5}$ Criteria: All 3 text elements share same text height All 3 text elements have same (or close +- 10%) X coordinate Value All 3 text elements are within Y coordinates value of Char height * 4 +- 10% of each other Example text in Pdf: 240 TT 12345 Required concatenated string: 240TT12345 I'm guessing the workflow would be something along the lines of: Open pdf Extract all text elements Find text matching first line of regex Is there a text element the same character height with the same X coordinate value below this element (within the height of the text element above +-10%)? Is there another text element the same character height with the same X coordinate value below this element (within the height of the text element above +-10%)? If there is, extract all text elements, concatenated to string, e.g. 240TT12345 Highlight the elements in the pdf. I would class myself as an intermediate coder, but I'm really struggling here because the number of lines to search using regex can be 2, sometimes 3, maybe 4. Perhaps a LINQ query to find all by Regex and proximity however happy to see all suggestions.