Mention just how loose this component is

[dandv]

var matcher = /^\w+:\/\/([^\s\.]+\.\S{2}|localhost[\:?\d]*)\S*$/;

Will fail SO badly in so many cases: IDNs, modern TLDs, parens in URLs, punctuation at the end etc.

There's a much more powerful regexp in component/regexps.uri.

I understand this component doesn't really aim to properly parse URLs like linkify, but perhaps it's better to just use the regexps component.

[ianstormtaylor]

can you give some examples? and do you have a fix for the IDNs? open to PRs

i think parens are valid in urls?

if anything, component/regexps is going to fail on new TLDs, it already fails on localhost, rare protocols, etc...

[dandv]

I think I found a library that's better than Component, maybe we can focus our efforts on improving that one - http://soapbox.github.io/jQuery-linkify/. A simple regexp just won't cut it.

[kevva]

https://github.com/segmentio/is-url/pull/9 will fix most of these issues.

[dandv]

Whether #9 will fix those issues I don't know. My point is, why develop yet another "is this string a URL" library when there are so many out there, and better at that to boot.

[davisjam]

Why develop yet another "is this string a URL" library

Perhaps this observation is too late now. This module gets 2M downloads/month on npm.

1. Worth closing this issue?
2. Test cases with valid but rejected URLs welcome.

[dandv]

Looks like validator has more traction. Too bad there's no TypeScript support.