Regular Expression to validate Domain Name

[Mantautas]

Dear Community,

On the Service catalog form we ask users for provide FQDM/Fully Qualified Domain name (www.example.com, www.example.co.uk, etc). ServiceNow has out-of-the box Regular expression for URL, however it contains "http".  Which regular expression should be used to check user provided URL in FQDM format only, no additional characters allowed. Thanks!

Regards,
Mantautas.

[Laszlo Balla · Accepted solution]

Valid point! 🙂 Try this:

/^(?!:\/\/)(w{3}+\.)?[a-zA-Z0-9][a-zA-Z0-9-]+\.[a-zA-Z]{2,6}?$/ji

[Mantautas]

It works! Thanks a lot. Last question - what if domain consists of "www.example.co.uk" ? The current rule will not allow such address

[Laszlo Balla · Accepted solution]

Perhaps this minor change at the end would do:

^(?!:\/\/)(w{3}+\.)?[a-zA-Z0-9][a-zA-Z0-9-]+\.[a-zA-Z\.]{2,6}?$