To parse web scraped content in Nim using CSS selectors we recommend the CSS3Selectors library which is designed with web scraping in mind:
import std/streams
import pkg/chame/minidom
import css3selectors
let html = """
<!DOCTYPE html>
<html>
<head><title>Example</title></head>
<body>
<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
</body>
</html>
"""
let document = Node(parseHtml(newStringStream(html)))
let elements = document.querySelectorAll("p:nth-child(odd)")
echo elements # @[<p>1</p>, <p>3</p>]
let htmlFragment = parseHTMLFragment("<h1 id='test'>Hello World</h1><h2>Test Test</h2>", Element())
let element = htmlFragment.querySelector("#test")
echo element # <h1 id="test">Hello World</h1>
CSS3Selectors was created to supersede nimquery which still works well for parsing HTML content in Nim if CSS3Selectors is not available:
from xmltree import `$`
from htmlparser import parseHtml
import nimquery
let html = """
<!DOCTYPE html>
<html>
<head><title>Example</title></head>
<body>
<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
</body>
</html>
"""
let xml = parseHtml(html)
let elements = xml.querySelectorAll("p:nth-child(odd)")
echo elements
# => @[<p>1</p>, <p>3</p>]
