Text search API for iOS

To search for text in a PDF using regular expression and then apply a link annotation on the highlighted result.

PTPDFDoc *doc = [[PTPDFDoc alloc] initWithFilepath: filename];
PTTextSearch *txt_search = [[PTTextSearch alloc] init];
unsigned int mode = e_ptwhole_word | e_ptpage_stop;
NSString *pattern = @"";

//use regular expression to find credit card number
mode |= e_ptreg_expression | e_pthighlight;
[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: pattern mode: mode start_page: -1 end_page: -1];
PTSearchResult *result = [txt_search Run];

if ( result ) 
{
  //add a link annotation based on the location of the found instance
  PTHighlights *hlts = [result GetHighlights];
  [hlts Begin: doc];
  while ( [hlts HasNext] )
  {
    PTPage *cur_page = [doc GetPage: [hlts GetCurrentPageNumber]];
    PTVectorQuadPoint *quads = [hlts GetCurrentQuads];
    int i = 0;
    for ( ; i < [quads size]; ++i )
    {
      //assume each quad is an axis-aligned rectangle
      PTQuadPoint *q = [quads get: i];
      double x1 = MIN(MIN(MIN([[q getP1] getX], [[q getP2] getX]), [[q getP3] getX]), [[q getP4] getX]);
      double x2 = MAX(MAX(MAX([[q getP1] getX], [[q getP2] getX]), [[q getP3] getX]), [[q getP4] getX]);
      double y1 = MIN(MIN(MIN([[q getP1] getY], [[q getP2] getY]), [[q getP3] getY]), [[q getP4] getY]);
      double y2 = MAX(MAX(MAX([[q getP1] getY], [[q getP2] getY]), [[q getP3] getY]), [[q getP4] getY]);
      PTPDFRect * rect = [[PTPDFRect alloc] initWithX1: x1 y1: y1 x2: x2 y2: y2];
      PTAction *action = [PTAction CreateURI: [doc GetSDFDoc] uri: @"http://www.pdftron.com"];

      PTLink *hyper_link = [PTLink CreateWithAction: [doc GetSDFDoc] pos: rect action: action];
      [cur_page AnnotPushBack: hyper_link];
    }
    [hlts Next];
  }
}

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