validDomain top-level constant

String const validDomain

validDomain is a constant RegExp pattern string used to validate domain names by combining several smaller pattern strings, each representing a different part or type of domain.

It is constructed as follows:

• It may optionally start with a validSubdomain, followed by
• a mandatory validDomainName, and ending with either
• a validGtld, or
• a validCctld, or
• a validPunycode.

Implementation

const validDomain =
    '(?:$validSubdomain*$validDomainName(?:$validGtld|$validCctld|$validPunycode))';