Regex : Its possible to do submatching in regex? - regex

Question

I create this regex to parse mongodb url as follow:
/mongodb://((?'username'\w+):(?'password'\w+)#)?(?'hosts'\w[,\w]*)(/(?'defaultdb'[\w.]+))?(\?(?'options'.*$))?$/m
I do some tests in regex101 with it, and I wanna to know if its possible to parse the ',' (commas) in hosts group to result in an array, and similarly do this in options group with '&' separator.
My intentions is iterate by the regex result and use the matches groups with your result in one way, without need to split by separator.
Expected example:
mongodb://user:password#host,host2,host3,host4/databasename?options=1&options=2
group user: user
group password: password
group hosts: host
group hosts: host2
group hosts: host3
group hosts: host4
group defaultdb: databasename
group options: options=1
group options: options=2

Answer 1

A possible work around to have all your data in the right order:
let str = 'mongodb://user:password#host,host2,host3,host4/databasename?options=1&options=2'
// substring(10) to avoid 'mongodb://'
console.log(str.substring(10).split(/[:#,/&?]/))
Edit: I see before your edit that you are on Node, so an other solution is:
let str = 'mongodb://user:password#host,host2,host3,host4/databasename?options=1&options=2'
let regex = /mongodb:\/\/(?<username>\w+):(?<password>\w+)#(?<hosts>[,\w]*)\/(?<defaultdb>[\w\.]+)?\?(?<options>.*$)?$/
function splitGroup(group, items)
{
items.forEach(function (item, index) {
res.groups[group+'_'+index] = item
});
}
res = regex.exec(str)
res.groups.hosts = res.groups.hosts.split(',')
res.groups.options = res.groups.options.split('&')
splitGroup('host', res.groups.hosts)
splitGroup('option', res.groups.options)
delete res.groups.hosts
delete res.groups.options
console.log(Object.keys(res.groups).filter(v => v.startsWith('host')))
// [ 'host_0', 'host_1', 'host_2', 'host_3' ]
console.log(Object.keys(res.groups).filter(v => v.startsWith('option')))
// [ 'option_0', 'option_1' ]