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Search for text in a PDF in PHP

To search for text in a PDF using regular expression.

$doc = new PDFDoc($filename);
$txt_search = new TextSearch();
$mode = TextSearch::e_whole_word | TextSearch::e_page_stop;
$pattern = "";

//use regular expression to find credit card number
$mode |= TextSearch::e_reg_expression | TextSearch::e_highlight;
$txt_search->SetMode($mode);
$pattern = "\\d{4}-\\d{4}-\\d{4}-\\d{4}"; //or "(\\d{4}-){3}\\d{4}"
$txt_search->SetPattern($pattern);

//call Begin() method to initialize the text search.
$txt_search->Begin( $doc, $pattern, $mode );
$searchResult = $txt_search->Run();

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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