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Text search

There are two parts to text searching. First is the UI component that is presented to the user. Second is an API guide to perform the text search functionality.

Text search API for Android

To search for text in a PDF using regular expression.

PDFDoc doc = new PDFDoc(filename);
TextSearch txt_search = new TextSearch();
int mode = TextSearch.e_whole_word | TextSearch.e_page_stop;
String pattern = "";

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

//call Begin() method to initialize the text search.
txt_search.begin(doc, pattern, mode, -1, -1);
TextSearchResult result =;

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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