#include <amxmodx>
#include <fakemeta>
#include <regex>

new g_szPattern[] = "[^\x20-\x7E]+"
new Regex:g_RegexPattern, g_ReturnValue
new g_szName[33][32]

public plugin_init()
{
    register_plugin("Nick validator", "1.0", "WaLkZ")

    register_forward(FM_ClientUserInfoChanged, "fwd_ClientUserInfoChanged")

    g_RegexPattern = regex_compile_ex(g_szPattern, g_ReturnValue)
}

public client_putinserver(id)
{
    get_user_name(id, g_szName[id], charsmax(g_szName[]))

    if (regex_match_c(g_szName[id], g_RegexPattern, g_ReturnValue ) > 0)
    {
        server_cmd("kick #%d ^"Special symbols detected in name^"", get_user_userid(id))
    }
}

public fwd_ClientUserInfoChanged(id, buffer)
{
    static szNewName[32]
    get_user_info(id, "name", szNewName, charsmax(szNewName))

    if (equal(szNewName, g_szName[id]))
    {
        return FMRES_IGNORED
    }

    if (regex_match_c(szNewName, g_RegexPattern, g_ReturnValue ) > 0)
    {
        client_print(id, print_console, "Special symbols in the nick are not allowed here :)")

        engfunc(EngFunc_SetClientKeyValue, id, buffer, "name", g_szName[id])

        return FMRES_SUPERCEDE
    }

    return FMRES_IGNORED
}