sharedDomains

Calculates how many dot-separated suffixes two strings share.

This is useful to see to what extent two addresses are similar.

pure @safe @nogc nothrow
sharedDomains
(
const string one
,
const string other
,
const bool caseSensitive = true
)

Parameters

one string

First domain string.

other string

Second domain string.

caseSensitive bool

Whether or not comparison should be done on a case-sensitive basis.

Return Value

Type: auto

The number of domains the two strings share.

TODO: Support partial globs.

Examples

int numDomains = sharedDomains("irc.freenode.net", "leguin.freenode.net");
assert(numDomains == 2);  // freenode.net

int numDomains2 = sharedDomains("Portlane2.EU.GameSurge.net", "services.gamesurge.net", caseSensitive:false);
assert(numDomains2 == 2);  // gamesurge.net
import std.conv : text;

immutable n1 = sharedDomains("irc.freenode.net", "help.freenode.net");
assert((n1 == 2), n1.text);

immutable n2 = sharedDomains("irc.rizon.net", "services.rizon.net");
assert((n2 == 2), n2.text);

immutable n3 = sharedDomains("www.google.com", "www.yahoo.com");
assert((n3 == 1), n3.text);

immutable n4 = sharedDomains("www.google.se", "www.google.co.uk");
assert((n4 == 0), n4.text);

immutable n5 = sharedDomains("", string.init);
assert((n5 == 0), n5.text);

immutable n6 = sharedDomains("irc.rizon.net", "rizon.net");
assert((n6 == 2), n6.text);

immutable n7 = sharedDomains("rizon.net", "rizon.net");
assert((n7 == 2), n7.text);

immutable n8 = sharedDomains("net", "net");
assert((n8 == 1), n8.text);

immutable n9 = sharedDomains("forum.dlang.org", "...");
assert((n9 == 0), n8.text);

immutable n10 = sharedDomains("blahrizon.net", "rizon.net");
assert((n10 == 1), n10.text);

immutable n11 = sharedDomains("rizon.net", "blahrizon.net");
assert((n11 == 1), n11.text);

immutable n12 = sharedDomains("rizon.net", "irc.rizon.net");
assert((n12 == 2), n12.text);

immutable n13 = sharedDomains("irc.gamesurge.net", "Stuff.GameSurge.net", caseSensitive:false);
assert((n13 == 2), n13.text);

immutable n14 = sharedDomains("irc.freenode.net", "irc.FREENODE.net", caseSensitive:false);
assert((n14 == 3), n14.text);

immutable n15 = sharedDomains("irc.SpotChat.org", "irc.FREENODE.net", caseSensitive:false);
assert((n15 == 0), n15.text);

Meta