How to create custom valid Url Regex

Question

I am trying to create a regex for first time for the URL having following conditions:

Starts with or without the www
Do not starts with http:// or https://
Allowed special characters are: hyphen (-) and dot (.)
Ends with a TLD like: .com, .io, .co.in, etc.

Some of the examples for reference:

Valid:

xyz.com
xyz-px.com
www.xyz.com
abc.xyz.px.io
www.abc.xyz.px.io

Invalid:

xyz-.com
xy_pm.com
http://xyz.io
https://xyz.io
http://www.pm.xyz
[email protected]
xyz.io$#
www.xy
xyz.io-

I have created a regex

/(^(?!https|http)?:\/\/(www\.?)[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,})/gi

But it is not working as desired.

Maybe like ^[^\W_]+(?:[-.][^\W_]+)*(?:\.[a-z]{2,})+$ regex101.com/r/E08Ce3/1 — The fourth bird
– The fourth bird, Commented Jun 7, 2021 at 9:08
It won't work for the fouth condition ending with Top Level Domain — Mohit Chandani
– Mohit Chandani, Commented Jun 7, 2021 at 10:59

The fourth bird · Accepted Answer · 2021-06-07 11:49:47Z

3

You might use

^[^\W_]+(?:[-.][^\W_]+)*\.(?:io|com)$

The pattern matches:

^ Start of string
[^\W_]+ Match 1+ word chars without an _
(?:[-.][^\W_]+)* Optionally repeat matching . or - and 1+ word chars without _
\. Match a literal dot
(?:io|com) Match any of the alternatives
$ End of string

Regex demo

answered Jun 7, 2021 at 11:49

The fourth bird

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Comments

DecPK · Accepted Answer · 2021-06-07 09:18:02Z

0

You can use

^(?!(http|https):\/\/)(?:www\.)?(?:(?:[a-zA-Z0-9])(?:[-\.][a-zA-Z0-9])?)+(?:\.[a-zA-Z0-9]+)$

DEMO - REGEXR

And the flowchart is:

answered Jun 7, 2021 at 9:18

DecPK

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3 Comments

Mohit Chandani Over a year ago

How to make sure that the string ends with a tld because now it can validate www.xy which is not a valid URL

DecPK Over a year ago

That's very hard to do this because there could be more than 1000 top level domain

Mohit Chandani Over a year ago

Yess but at the end there must be any top level domain not necessarily .com,.in it can have .xyz or anything ,ie. www.xy.xy is allowed but not www.xy

User863 · Accepted Answer · 2021-06-07 09:05:23Z

-1

The modified regex is

/^(?!(https|http):\/\/)(?:www\.)?[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9](?:.[^\s\W]{2,})+$/gi

https://regex101.com/r/aNy8St/1

answered Jun 7, 2021 at 9:05

User863

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3 Comments

Jax-p Over a year ago

Explain your modifications please.

Mohit Chandani Over a year ago

It won't work in case we want the urls to end with a TLD like: .com, .io, .co.in, etc.

Shadow Over a year ago

There's no need to bother with the 'www' part - it's just a subdomain, which is handled already by the next capture group.

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