Please describe exactly what the proposed function will do. For example, please give the documentation comment that would appear in https://golang.org/pkg/strings. Thanks.

Doesn't strconv.Unquote do the job you need? You need to attach double quotes to the string, but that is a trivial adjustment.

https://play.golang.org/p/UcgucN3TB_h

https://play.golang.org/p/THD-0MyJmnW

If the string contains quotation marks in the middle.It looks more difficult to handle.

That is unfortunate, but the code is telling you the truth: That string is not a valid Go string to be unquoted, as it contains unescaped double quotes. You are asking to solve a problem that is not well defined within the Go environment.

Go has distinct rules for backslashes that are context-dependent. " is legal only in a double-quoted string, while ' is legal only in a rune constant. That is why strconv.Unquote requires the quote character to be included: it defines the rules for unquoting.

You are asking for a new set of rules, and so it seems unlikely to be something needed in the standard Go library. I suggest you write the code that does what you need, and use.

PHP stripslashes is essentially PHP unquote, as far as I can tell.
If you need to unquote Go strings, use strconv.Unquote.
If you need to unquote another syntax, you should use a syntax-specific unquoter.
It's impossible to write a "generic" unquoter because you wouldn't know which syntaxes to allow or not.

This proposal has been added to the active column of the proposals project
and will now be reviewed at the weekly proposal review meetings.
— rsc for the proposal review group

Based on the discussion above, this proposal seems like a likely decline.
— rsc for the proposal review group

No change in consensus, so declined.
— rsc for the proposal review group