A utility module for conversion routines, often handy in HTML generation.

Methods
H
U
Class Public methods
h(s)
Alias for: html_escape
html_escape(s)

A utility method for escaping HTML tag characters in s.

require "erb"
include ERB::Util

puts html_escape("is a > 0 & a < 10?")

Generates

is a &gt; 0 &amp; a &lt; 10?
Also aliased as: h

Source: show | on GitHub 

# File lib/erb.rb, line 930
def html_escape(s)
  CGI.escapeHTML(s.to_s)
end
u(s)
Alias for: url_encode
url_encode(s)

A utility method for encoding the String s as a URL.

require "erb"
include ERB::Util

puts url_encode("Programming Ruby:  The Pragmatic Programmer's Guide")

Generates

Programming%20Ruby%3A%20%20The%20Pragmatic%20Programmer%27s%20Guide
Also aliased as: u

Source: show | on GitHub 

# File lib/erb.rb, line 949
def url_encode(s)
  s.to_s.dup.force_encoding("ASCII-8BIT").gsub(/[^a-zA-Z0-9_\-.]/n) {
    sprintf("%%%02X", $&.unpack("C")[0])
  }
end