Extracting data from strings

You can use a regular expression to locate and extract text that occurs within a pattern.

How to do it...

Use capture groups to extract substrings that match a pattern.

How it works...

package main
import (
     "fmt"
     "regexp"
)
func main() {
     re := regexp.MustCompile(`^(\w+)=(\w+)$`)
     result := re.FindStringSubmatch(`property=12`)
     fmt.Printf("Key: %s value: %s\n", result[1], result[2])
     result = re.FindStringSubmatch(`x=y`)
     fmt.Printf("Key: %s value: %s\n", result[1], result[2])
}

Here is the output:

Key: property value: 12
Key: x value: y

Let’s look at this regular expression:

• ^(\w+): A string composed of one or more word characters at the beginning of the line (capture group 1)
...