How to Escape Variables with Printf in Go?

Escape Variables with Printf: Handling Special Characters

If you encounter a need to escape variables while using fmt.Printf, you may encounter difficulties. For instance, consider the following code:

fmt.Printf("Escape this -> %v... Do not escape this -> %v", "Unescaped")

In this example, you intend to escape only the first occurrence of %v. However, using %v is ineffective. To achieve the desired result, you can employ the %% escape sequence, which represents a literal (unexpandable) percent sign.

Escaping Variables with %%

The %% sequence provides a solution to escape variables in fmt.Printf. When used, it interprets the following character (in this case, v) as a literal instead of a format specifier. Therefore, to escape the first %v, you can use the following code:

fmt.Printf("Escape this -> %%v... Do not escape this -> %v", "Unescaped")

Now, the output will display the escaped %v as follows:

Escape this -> %v... Do not escape this -> Unescaped

Understanding %%

It's essential to note that %% sequences behave differently from %v format specifiers. While %v allows for the insertion of variables, %% outputs a literal percent sign without affecting the variable.

For a comprehensive reference on fmt.Printf formatting, refer to the Go documentation: https://golang.org/pkg/fmt/.

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