Web Extract-1.930.1927

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Last updated: Jul 22, 2022 by Jiyoon Ahn (Unlicensed)Version comment
3 min read



Web Extract

  • You can build a bot to extract data from websites (Web Scraping) using this tool.
  • In order to use this operation, you must have a knowledge about HTML and YAML.



Need help?

Technical contact to tech@argos-labs.com


May you search all operations,

Contents

  1. This operation is used after extracting the HTML source file from your browser. 
  2. The Parameters.
  3. A simple example below should help you build the web scraping bot.
  4. Below are the explanations of the Rule file construction (syntax).
  5. Use of xpath is also possible to specify the target area in the HTML source file like in an example below.



1. This operation is used after extracting the HTML source file from your browser. 





2. The Parameters.


1) Specify your HTML Source file here.

2) Specify your Rule file (YAML) here --- always check the check-box --- this file is mandatory.

3) If your data has many occurrences, you can limit the # of data to be extracted by setting the number here (0 means no limitation = default).

4) Define preferred encoding standard of your HTML file here – if your choice does not work Web Extract will go to auto-detect mode.

5) Define the HTML parsing standard here or leave it unchecked for auto detect mode.

6) Choose your output format (String, CSV, or File).

7) You must set your variable at Settings menu in the Main menu.



3. A simple example below should help you build the web scraping bot.


  • Below is your target website page.



  • And then below is the HTML source file.


  • Below is the Rule file (YAML).



  • And finally, the output file with extracted data.

  • The Rule file structure guide



4. Below are the explanations of the Rule file construction (syntax). 



1) Give explanations of the Rule file as comments.

2) Regardless of the desired final output format, always start with [csv].

3) [or] is used when you have more than just one type of HTML source returned from the website. It is optional.

4) [header] defines the labels of your output data table.

5) Rest of the YAML is to specify the data to be extracted. Use combinations of tag (name) and attribute (key+value) to identify the data. 

You may use multiple attributes if needed. Please note that the Rule file also includes “split” and “re-replace” for correcting the data.




5. Use of xpath is also possible to specify the target area in the HTML source file like in an example below. 



Additional explanations are provided below.

  The Split command can take integer, or you can define separate as shown in this example.

 The re-replace command will replace the “from” value (regular expression) to “to” value (string).

 Global options can be added at the bottom of the Rule file.

In this example, it shows that when there is no result that data says “There is no Result (default is “No Result”) and skip-empty-row can take true/false parameter.