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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