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Search for text in a PDF in UWP

To search for text in a PDF using regular expression.

PDFDoc doc = new PDFDoc(filename);
Int32Ref pageNumber = new Int32Ref(0);
StringRef resultString = new StringRef();
StringRef ambientString = new StringRef();
Highlights highlights = new Highlights();
TextSearch textSearch = new TextSearch();

Int32 mode = (Int32)(TextSearchSearchMode.e_whole_word | TextSearchSearchMode.e_page_stop | TextSearchSearchMode.e_highlight);

//use regular expression to find credit card number
mode |= (Int32)(TextSearchSearchMode.e_reg_expression | TextSearchSearchMode.e_highlight);
String pattern = "\\d{4}-\\d{4}-\\d{4}-\\d{4}"; //or "(\\d{4}-){3}\\d{4}"

//call Begin() method to initialize the text search.
textSearch.Begin(doc, pattern, mode, -1, -1);
TextSearchResultCode code = textSearch.Run(pageNumber, resultString, ambientString, highlights);

Search PDF files for text
Full code sample which shows how to use TextSearch to search text on PDF pages using regular expressions.

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