From the old Sidebar: How not to find a trailing substring match

[tarunik]

@NeilRashbrook said:

This code is paraphrased from some open source:

// Consider host.domain.invalid and *.domain.invalid: // "host.domain.invalid".Find(".domain.invalid") is 4 // 4 + strlen(".domain.invalid") == 4 + 15 == 19 == strlen("host.domain.invalid") // Prerequiste: wildcardString begins with "*.". static bool HostMatchesWildcard(const char* host, string wildcard) { if (!host) return false;

string wildcardSubstr(wildcard.c_str() + 1, wildcard.length() - 1);
string hostString(host, strlen(host));
size_t index = hostString.find(wildcardSubstr);
return index != string::npos &&
     index + wildcardSubstr.length() == hostString.length();

}


(Names have been changed to protect the guilty.)

Filed under: Reinventing square wheels

[chubertdev]

So does that mean that C# really is the least bad?

[Arantor]

It's not like they did it with PHP...