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Extract_String()

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    #1

    Extract_String()

    Hello All,

    I am using the http_get_page_2() function to fill the value of a variable named "Source".

    The following is the part of the returned page that I am interested in parsing.

    Code:
    <tr><td align=left><span class="heading">Principal Address</span></td></tr>
<tr><td class="data">2964 AVIATION AVE<br>
MIAMI FL 33133-6522 </td></tr>
    Next, I want to extract "2964 AVIATION AVE", "MIAMI", "FL" and "33133-6522" into individual components for insertion into fields within my table.

    I have tested the extract_string function in an attempt to parse the "2964 AVIATION AVE" element, but it simply returnes an empty character string of "".

    Here's the code I used...


    Code:
    extract_string(source,">Principal Address</span></td></tr><tr><td class=\"data\">","<br>")
    Note: Forcing the variable "source" to equal the entire string without any CR/LF and then using extract_string returns the desired result.

    I suspect that extract_string() is hanging up on the CR/LF in the page's source, but I'm not sure how to overcome this.

    Any assistance will be most appreciated.

    Kindest Regards,

    Louis
    Tags: None
    #2
    Re: Extract_String()

    Code:
    txt=<<%txt%
#<tr><td align=left><span class="heading">Principal Address</span></td></tr>
#<tr><td class="data">2964 AVIATION AVE<br>
#MIAMI FL 33133-6522 </td></tr>%txt%
?extract_string(txt,"a\">","<",1)
= "2964 AVIATION AVE"

?extract_string(txt,"<br>"+crlf(),"</td",1)
= "MIAMI FL 33133-6522 "
    Last edited by G Gabriel; 06-02-2008, 11:01 PM.

    Comment

      #3
      Re: Extract_String()

      Using your same expression with slight modification:
      Code:
      Source=<<%txt%
#<tr><td align=left><span class="heading">Principal Address</span></td></tr>
#<tr><td class="data">2964 AVIATION AVE<br>
#MIAMI FL 33133-6522 </td></tr>%txt%
?extract_string(source,">Principal Address</span></td></tr>"+crlf()+"<tr><td class=\"data\">","<br>")
= "2964 AVIATION AVE"

      Comment

        #4
        Re: Extract_String()

        Gabe,

        Thanks for your replies.

        I think I'm beginning to see what you are doing, but I'm not so sure this is going to work for me. I need to parse the address information from a website.

        Here's some code that successfully writes the contents of the web page to a variable named source...

        Code:
        Dim Corp_Name as c
Corp_Name="GROVE PLACE CONDOMINIUM ASSOCIATION, INC."
Dim Doc_Num as c
Doc_Num="N39200"
Dim source as c
source = http_get_page2("http://www.sunbiz.org/scripts/cordet.exe?action=DETFIL&inq_doc_number="+Doc_Num+"&inq_came_from=NAMFWD&cor_web_names_seq_number=0000&names_name_ind=N&names_cor_number=&names_name_seq=&names_name_ind=&names_comp_name="+Corp_Name+"&names_filing_type=")
        Now, from this point, how do I use extract_string() to parse the individual elements from the variable "source"?

        Thanks

        Louis

        Comment

          #5
          Re: Extract_String()

          Hi Louis,

          There is a very good example by Dr Peter Wayne on Screen Scraping that goes into a lot of detail.

          http://www.learn alpha.com/menubar.htm

          Hope this helps.
          Regards
          Keith Hubert
          Alpha Guild Member
          London.
          KHDB Management Systems
          Skype = keith.hubert


          For your day-to-day Needs, you Need an Alpha Database!

          Comment

            #6
            Re: Extract_String()

            Hey Keith,

            Long time no hear.

            Thank you for the reference. I'll check it out.

            Louis

            Comment

              #7
              Re: Extract_String()

              Your welcome Louis,

              Here's another one http://msgboard.alphasoftware.com/al...ad.php?t=71405

              With some working examples from other contributors.
              Regards
              Keith Hubert
              Alpha Guild Member
              London.
              KHDB Management Systems
              Skype = keith.hubert


              For your day-to-day Needs, you Need an Alpha Database!

              Comment

                #8
                Re: Extract_String()

                Originally posted by Louis Nickerson View Post
                Now, from this point, how do I use extract_string() to parse the individual elements from the variable "source"?

                Thanks

                Louis
                Not extract_string() but using the string scanner object instead.
                Code:
                ss = stringscanner.Create(source)

ss.SkipToString(">Principal Address<")
ss.SkipToString("data\">")
ss.SkipoverString("data\">")
addr = ss.ScanToString("<br>")
ss.SkipOverString("<br>")
txt = ss.ScanToString("</td>")

txt = alltrim(stritran(txt,crlf()))

city = word(txt,1," ",w_count(txt)-2)
state = word(txt,-2)
zip = word(txt,-1)

?addr
= "2964 AVIATION AVE"

?city
= "MIAMI"

?state
= "FL"

?zip
= "33133-6522"
                Tim Kiebert
                Eagle Creek Citrus
                A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.

                Comment

                  #9
                  Re: Extract_String()

                  Just hit your variable source with these two functions, then use your same extract code, but without consideration for the quotation marks.

                  source = stritran(source,"\"")
                  source = stritran(source,crlf())
                  Steve Wood
                  See my profile on IADN

                  Comment

                    #10
                    Re: Extract_String()

                    Keith...Thanks for the additional reference.

                    Tim...Never used strings scanner before...didn't even know it existed, but it looks very interesting. I will read up on it, I'm sure I'll be able to use it in the future.

                    Steve...BINGO...you hit the nail on the head. Short, sweet and it works.

                    Thank you all for your assistance.

                    Louis

                    Comment

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