isDomainName
Test if a value is a domain name.
Usage
var isDomainName = require( '@stdlib/assert/is-domain-name' );
isDomainName( value )
Tests if a value is a domain name.
var bool = isDomainName( 'example.com' );
// returns true
bool = isDomainName( 'foo@bar.com' );
// returns false
Notes
- Validation adheres to RFC 2181, which defines the syntax for domain names and stipulates that domain names must be 255 characters or less.
Examples
var isDomainName = require( '@stdlib/assert/is-domain-name' );
var bool = isDomainName( 'www.example.com' );
// returns true
bool = isDomainName( 'foo@bar.com' );
// returns false
bool = isDomainName( 'beep boop' );
// returns false
bool = isDomainName( null );
// returns false
bool = isDomainName( 5.0 );
// returns false
CLI
Usage
Usage: is-domain-name [options] [<string>]
Options:
-h, --help Print this message.
-V, --version Print the package version.
--split sep Delimiter for stdin data. Default: '/\\r?\\n/'.
Notes
If the split separator is a regular expression, ensure that the
splitoption is either properly escaped or enclosed in quotes.# Not escaped... $ echo -n $'foo@bar.com\nbaz.com' | is-domain-name --split /\r?\n/ # Escaped... $ echo -n $'foo@bar.com\nbaz.com' | is-domain-name --split /\\r?\\n/The implementation ignores trailing delimiters.
Examples
$ is-domain-name example.com
true
To use as a standard stream,
$ echo -n 'example.com' | is-domain-name
true
By default, when used as a standard stream, the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.
$ echo -n 'beep boop\tbaz.com' | is-domain-name --split '\t'
false
true