Function validate_repo_name

subprojects/llama.cpp/common/download.cpp:56–59

validate repo name format: owner/repo

// validate repo name format: owner/repo
static bool validate_repo_name(const std::string & repo) {
    static const std::regex repo_regex(R"(^[A-Za-z0-9_.\-]+\/[A-Za-z0-9_.\-]+$)");
    return std::regex_match(repo, repo_regex);
}

static std::string get_manifest_path(const std::string & repo, const std::string & tag) {
    // we use "=" to avoid clashing with other component, while still being allowed on windows