根据模式从字符串中捕获值

Question

I am looking for an approach to the following problem. It captures all * values from the string using a provided pattern.

function capture(pattern, string) {
}

Example:

Input

• Pattern The quick brown * jumps over the lazy *

• String The quick brown fox jumps over the lazy dog

Output [fox, dog]

Is it possible to solve it using regex?

Answer 1

The trick is to convert the pattern into a regular expression that captures the expected values from the given string:

func capture(pat, str string) []string {
    // Capture all sequences of non-whitespace characters between word boundaries.
    re := strings.Replace(pat, "*", `(\b\S+\b)`, -1)
    groups := regexp.MustCompile(re).FindAllStringSubmatch(str, -1)
    if groups == nil {
        return []string{}
    }
    return groups[0][1:]
}

func main() {
    pat := "The quick brown * jumps over the lazy *"
    str := "The quick brown fox jumps over the lazy dog"

    fmt.Printf("OK: %s
", capture(pat, str))
    // OK: [fox dog]
}