How to Capture Repeating Groups in Go Regular Expressions?

Capturing Repeating Groups in GO

When attempting to parse strings that follow a specific format, such as uppercase words followed by zero or more double-quoted arguments, it is necessary to define a regular expression that captures the desired elements. In the provided scenario, the attempt to capture repeating arguments using the following regular expression:

re1, _ := regexp.Compile(`([A-Z]+)(?: "([^"]+)")*`)

failed to capture all arguments correctly. To resolve this issue, a revised regular expression is proposed:

re1, _ := regexp.Compile(`([A-Z]+)|(?: "([^"]+)")`)

This revised regular expression matches either an uppercase word or a double-quoted string without capturing the surrounding quotes. This approach allows for better capture of repeating arguments, as demonstrated in the following code snippet:

results := re1.FindAllStringSubmatch(`COMMAND "arg1" "arg2" "arg3"`, -1)

fmt.Println("Command:", results[0][1])
for _, arg := range results[1:] {
    fmt.Println("Arg:", arg[2])
}

This revised approach successfully captures the command and its three arguments and prints them separately.

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