How can we directly convert "\u003chtml\u003e"
to "<html>"
? Conversion of "<html>"
to "\u003chtml\u003e"
is quite easy using json.Marshal()
, but json.Unmarshal()
is quite lengthy and cumbersome. Is there any direct way to do that in golang?
如何转换HTML标记中的转义字符?
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3条回答 默认 最新
- dongpan1416 2016-04-10 11:34关注
You can use the
strconv.Unquote()
to do the conversion.One thing you should be aware of is that
strconv.Unquote()
can only unquote strings that are in quotes (e.g. start and end with a quote char"
or a back quote char`
), so we have to manually append that.Example:
// 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)
Output (try it on the Go Playground):
\u003chtml\u003e <html>
Note: To do HTML text escaping and unescaping, you can use the
html
package. Quoting its doc:Package html provides functions for escaping and unescaping HTML text.
But the
html
package (specificallyhtml.UnescapeString()
) does not decode unicode sequences of the form\uxxxx
, only&#decimal;
or&#xHH;
.Example:
fmt.Println(html.UnescapeString(`\u003chtml\u003e`)) // wrong fmt.Println(html.UnescapeString(`<html>`)) // good fmt.Println(html.UnescapeString(`<html>`)) // good
Output (try it on the Go Playground):
\u003chtml\u003e <html> <html>
Note #2:
You should also note that if you write a code like this:
s := "\u003chtml\u003e"
This quoted string will be unquoted by the compiler itself as it is an interpreted string literal, so you can't really test that. To specify quoted string in the source, you may use the backtick to specify a raw string literal or you may use a double quoted interpreted string literal:
s := "\u003chtml\u003e" // Interpreted string literal (unquoted by the compiler!) fmt.Println(s) s2 := `\u003chtml\u003e` // Raw string literal (no unquoting will take place) fmt.Println(s2) s3 := "\\u003chtml\\u003e" // Double quoted interpreted string literal // (unquoted by the compiler to be "single" quoted) fmt.Println(s3)
Output:
<html> \u003chtml\u003e
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