How to Escape Printf Variables in Go?

Escaping Printf Variables

In Go's fmt package, the Printf function provides a powerful way to format and print values. However, there may be times when you need to escape a specific variable from being formatted.

Consider the following example where you want to escape the first occurrence of %v while leaving the second one intact:

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

Attempting to escape the %v by using %v will not work. To achieve the desired output, you can utilize the %% escape sequence.

Solution

The %% escape sequence represents a literal percent sign, which is not interpreted as a formatting specifier. Therefore, to escape the first occurrence of %v in the example above, you can modify the code as follows:

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

This will result in the output:

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

By using %%, you can effectively prevent the %v from being formatted and preserve it as a literal percent sign. This technique allows for greater control over the formatting and output of your strings in Go.

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