Javascript Regex match any word that starts with '#' in a string

Question

I'm very new at regex. I'm trying to match any word that starts with '#' in a string that contains no newlines (content was already split at newlines).

Example (not working):

var string = "#iPhone should be able to compl#te and #delete items"
var matches = string.match(/(?=[\s*#])\w+/g)
// Want matches to contain [ 'iPhone', 'delete' ]

I am trying to match any instance of '#', and grab the thing right after it, so long as there is at least one letter, number, or symbol following it. A space or a newline should end the match. The '#' should either start the string or be preceded by spaces.

This PHP solution seems good, but it uses a look backwards type of functionality that I don't know if JS regex has: regexp keep/match any word that starts with a certain character

Answer 1

var re = /(?:^|\W)#(\w+)(?!\w)/g, match, matches = [];
while (match = re.exec(s)) {
  matches.push(match[1]);
}

Check this demo.

let s = "#hallo, this is a test #john #doe",
  re = /(?:^|\W)#(\w+)(?!\w)/g,
  match, matches = [];

while (match = re.exec(s)) {
  matches.push(match[1]);
}

console.log(matches);