How to iterate through regex matching groups

say my data looks like this:

name=peter 
age=40
id=99

I can create a regex

(\w+)=(\w+)

To match name, age, and id into group1, and peter, 40, 99 into group two. However, I want to iterate and even selectively iterate through these groups. E.g.,

I want to do different processing if the group1 value is id. So the algorithm is like

//iterate through all the group1, if I see group1 value is "id", then I assign the corresponding group2 key to some other variable. E.g., newVar = 99

The second thing I want to do is to just jump to the third instance of the matching group1 and get the key "id" out instead of iterating.

Use FindAllStringSubmatch to find all the matches:

pat := regexp.MustCompile(`(\w+)=(\w+)`)
matches := pat.FindAllStringSubmatch(data, -1) // matches is [][]string

Iterate through the matched groups like this:

for _, match := range matches {
	fmt.Printf("key=%s, value=%s\n", match[1], match[2])
}

Check for "id" by comparing with match[1]:

for _, match := range matches {
	if match[1] == "id" {
		fmt.Println("the id is: ", match[2])
	}
}

Get the third match by indexing:

match := matches[2] // third match
fmt.Printf("key=%s, value=%s\n", match[1], match[2])

playground example