Check if String is HTML or not in ruby

Question

How can we check the string is HTML or not using Ruby?

If string contains html tag then returns true otherwise false

user513951 · Accepted Answer

If string contains html tag then returns true otherwise false

This test ("string contains <html>") is not sufficient to determine whether a string is HTML.

How can we check the string is HTML or not using Ruby?

The excellent Nokogiri gem provides HTML validation.

$ gem install nokogiri

require 'nokogiri'

Nokogiri::HTML.parse("<foo>bar</foo>").validate

# => [#<Nokogiri::XML::SyntaxError...>, ...]

Weston · Answer

If you just want to see if a fragment of html is correct without validating tags:

Nokogiri::XML("<foo>bar</foo>").errors.empty?

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