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Find Invoice Total Amount in PDF with Regex - VB.NET

PDF Extractor SDK sample in VB.NET demonstrating ‘Find Invoice Total Amount in PDF with Regex’

Program.vb
Imports Bytescout.PDFExtractor

' Note: if you are looking for a more higher level API to extract data from invoices, reports, statements
' then please check Document Parser SDK and Web API at https://bytescout.com/products/developer/documentparsersdk/index.html
' and https://pdf.co for secure and scalable web api

Module Program

    Sub Main()

        Try
            ' Create Bytescout.PDFExtractor.TextExtractor instance
            Using extractor As TextExtractor = New TextExtractor()
                extractor.RegistrationName = "demo"
                extractor.RegistrationKey = "demo"

                ' Load sample PDF document
                extractor.LoadDocumentFromFile("SampleInvoice.pdf")

                ' Enable the regular expression 
                extractor.RegexSearch = True

                Dim pageCount As Integer = extractor.GetPageCount()

                ' Search through pages
                For i As Integer = 0 To pageCount - 1
                    ' Search total number
                    Dim regexPattern As String = "(TOTAL: )[$]\d+"
                    ' See the complete regular expressions reference at https://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx

                    ' Search each page for the pattern
                    If extractor.Find(i, regexPattern, False) Then

                        Do
                            ' Iterate through each element in the found text
                            For Each element As ISearchResultElement In extractor.FoundText.Elements
                                Console.WriteLine("Found Total Amount Number: " & element.Text.Replace("TOTAL:", "").Trim())
                            Next
                        Loop While extractor.FindNext()

                    End If
                Next
            End Using

        Catch ex As Exception
            Console.WriteLine("Error: " & ex.Message)
        End Try

        Console.WriteLine()
        Console.WriteLine("Press enter key to continue...")
        Console.ReadLine()

    End Sub

End Module

Download Source Code (.zip)

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