Name
  pdf.FindPrev -- find previous instance of search string (V1.1)
Synopsis

      res = pdf.FindPrev(id, page)

Function
  This function can be used to continue a search operation initiated by pdf.FindStart(). Specifically, `pdf.FindPrev()` will find the previous occurrence of the search string passed to pdf.FindStart(). If another instance of the search string could be found, `pdf.FindPrev()` will return `True` and you can get the information about where the string was found using pdf.GetFindResult(). Otherwise, `False` is returned.

  The page to use must be specified in the `page` argument. It must be a number in the range of 1 to the total number of pages in the document and the page must have been previously loaded using pdf.LoadPage() with the `text` argument set to `True`. The PDF document specified by `id` must have been previously opened using pdf.OpenDocument().

Inputs
  id
    identifier of the PDF document to use
  page
    page number to search (starting from 1)
Results
  res
    `True` if the search string could be found, `False` otherwise

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