Regex Practice 7/8

Capstone: extracting prices

Everything so far finds one match. Add the g (global) flag and str.match(regex) changes behavior: instead of an array with capture-group details, it returns every match found in the string, in order - or null if there are none.

This is the shape of real text-extraction work: a messy paragraph, a pattern for the piece you want, and a loop-free way to pull out every occurrence.

Your task: write extractPrices(text), returning an array of every dollar amount found in text (like "$4" or "$19.99"), in the order they appear. Return an empty array if none are found. A price is a $ followed by one or more digits, optionally followed by a decimal point and exactly two digits.

You'll practice:

Finding every match with the g flag
Handling match()'s null result when nothing matches
Combining \$, \d+, and an optional group into one pattern

// Write extractPrices(text): every "$<digits>" or "$<digits>.<2 digits>"
// found in text, in order, as an array. Empty array if none found.
function extractPrices(text) {

}