HTML Parsing Utilities

• getElementsByTag(html, tag)

  • Extracts all inner content of a given tag from an HTML string.
  • Example:

    const items = getElementsByTag(html, 'div'); // returns array of inner HTML for all <div> elements

• getAttribute(html, tag, attr)

  • Extracts the value of an attribute from the first occurrence of a tag in the HTML string.
  • Example:

    const src = getAttribute(html, 'img', 'src'); // returns the src attribute of the first <img>

• getInnerText(html)

  • Removes all HTML tags and returns the plain text content.
  • Example:

    const text = getInnerText('<p>Hello <b>world</b></p>'); // 'Hello world'

Text Extraction Helpers

• extractBetween(str, start, end)

  • Extracts the substring between two markers.
  • Example:

    const chapter = extractBetween(html, '<h1>', '</h1>');

• stripHtml(html)

  • Removes all HTML tags from a string.
  • Example:

    const clean = stripHtml('<div>foo</div>'); // 'foo'

• normalizeWhitespace(str)

  • Collapses all whitespace to single spaces and trims the string.
  • Example:

    const norm = normalizeWhitespace('foo   bar\n\t baz'); // 'foo bar baz'

Encoding/Decoding Utilities

• urlEncode(str)

  • URL-encodes a string.
  • Example:

    const encoded = urlEncode('hello world'); // 'hello%20world'

• urlDecode(str)

  • Decodes a URL-encoded string.
  • Example:

    const decoded = urlDecode('hello%20world'); // 'hello world'

• htmlEntityDecode(str)

  • Decodes basic HTML entities (&, <, >, ", ').
  • Example:

    const decoded = htmlEntityDecode('Tom &amp; Jerry &lt;3'); // 'Tom & Jerry <3'