How to Efficiently Convert HTML Escape Characters in Go?

Converting HTML Escape Characters Efficiently

In Golang, the straightforward conversion of escaped HTML characters is necessary for various tasks. One common challenge is converting "u003chtmlu003e" to "". While json.Marshal() can easily handle the reverse conversion, json.Unmarshal() can be cumbersome and time-consuming.

Utilizing strconv.Unquote()

Fortunately, the strconv.Unquote() function offers a solution to this conundrum. This function allows for efficient unquoting of escaped strings. However, it requires strings to be enclosed in quotes.

Practical Implementation

// Important to use backtick ` (raw string literal)
// else the compiler will unquote it (interpreted string literal)!

s := `\u003chtml\u003e`
fmt.Println(s)
s2, err := strconv.Unquote(`"` + s + `"`)
if err != nil {
    panic(err)
}
fmt.Println(s2)

Running this code in the Go Playground produces the desired result:

\u003chtml\u003e

Alternative Options

The html package in Golang also provides functions for HTML text escaping and unescaping. While it handles ASCII characters effectively, it does not support unicode sequences of the form uxxxx, only decimal; or HH;.

However, it's important to note that backslash-escaped strings (like "u003chtmlu003e") are automatically unquoted by the compiler as interpreted string literals. To avoid this unquoting, use raw string literals specified with backticks (`) or double-quoted interpreted string literals.

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