ss := []string{
		``,
		`abc def`,
		`a & b`,
		`a&b`,
		`a &amp b`,
		`"`,
		`"`,
		`"<&>"`,
		`&quot;&lt;&amp;&gt;&quot;`,
		`3&5==1 && 0<1, "0&lt;1", a+acute=&aacute;`,
		`The special characters are: <, >, &, ' and "`,
	}
	for _, s := range ss {
		if got := UnescapeString(EscapeString(s)); got != s {
			t.Errorf("got %q want %q", got, s)
		}
	}
}

var (

func EscapeString(s string) string {
	return htmlEscaper.Replace(s)
}

// UnescapeString unescapes entities like "&lt;" to become "<". It unescapes a
// larger range of entities than EscapeString escapes. For example, "&aacute;"
// unescapes to "á", as does "&#225;" and "&#xE1;".
// UnescapeString(EscapeString(s)) == s always holds, but the converse isn't
// always true.
func UnescapeString(s string) string {
	populateMapsOnce.Do(populateMaps)