Regex Practice 3/8

Quantifiers

A character class matches one position. A quantifier right after it says how many times it may repeat: + means "one or more," {n,m} means "between n and m times." \d+ matches a whole run of digits, however long - not just one.

str.match(regex) (no g flag) returns an array whose first item, match[0], is the matched text - or null if nothing matched. That's how you get the actual text a pattern found, not just true/false.

Your task: write matchDigits(str), returning the first run of one or more digits found in str (or null if there isn't one), and matchCode(str), returning the first run of 2 to 4 digits found (or null).

You'll practice:

Matching a repeat with + (one or more)
Matching a count range with {n,m}
Extracting matched text with .match()

// Write matchDigits(str): the first run of 1+ digits found, or null.
function matchDigits(str) {

}

// Write matchCode(str): the first run of 2 to 4 digits found, or null.
function matchCode(str) {

}