How to Capture Multiple Arguments in Go Using Regular Expressions?

Capturing Multiple Groups in Go: A Case Study

When parsing strings containing uppercase words followed by optional double-quoted arguments, isolating individual groups can be challenging. One common approach involves using regular expressions, as exemplified by the following code snippet:

<code class="go">re1, _ := regexp.Compile(`([A-Z]+)(?: "([^"]+)")*`)
results := re1.FindAllStringSubmatch(input, -1)</code>

However, issues can arise when multiple arguments are present, as only the last argument is captured. To resolve this, a more flexible regular expression is needed.

Enhanced Regular Expression

By relaxing the grouping constraints, we can capture both commands and arguments effectively:

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

In this revised regex:

• The first group ([A-Z] ) matches uppercase words (commands).
• The second group (?: "([^"] )") matches double-quoted arguments, allowing multiple occurrences.

Extraction and Display

Once the groups are captured, we can extract and display the command and arguments separately:

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

This approach enables efficient parsing of strings with well-defined command structures.

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