I need to retrieve all the links to text files in an HTML document, I don't know what the best way to do this is but, I have tried the following in ruby...
line.scan(/<a href="([\w+:\/.-]*.txt)/)
but I am not sure if this expression covers all possible links pointing to text file, I am wondering if there are some bui开发者_运维技巧lt-in regular expressions for this? or if anyone knows of a better way to retrieve all links to a text file in a huge webpage.
This will walk through the HTML and find all hrefs with a '.txt' extension:
#!/usr/bin/env ruby
require 'nokogiri'
html = <<EOT
<html>
<head><title>foo</title></head>
<body>
<a href="file.txt">text file</a>
<a href="file.jpg">jpg file</a>
<a href="file2.txt">text file 2</a>
</body>
</html>
EOT
doc = Nokogiri::HTML(html)
puts doc.search('a').select { |n| n['href'][/\.txt$/] }.map{ |n| n['href'] }
> file.txt
> file2.txt
It's using Nokogiri to parse the content, which really is a lot more bullet-proof than trying to use regex.
Try this (captures all txt files, not just links):
html.scan(/[^\s"']+\.txt/)
To capture links to text files only:
html.scan(/<a [^<>\n]*?href=["']([^\s"']+\.txt)["'][^<>\n]*?>.*?<\/a>/m)
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