Валидация вводимого имени пользователя

app/views/Profile/MyProfile.tsx

@@ -1,4 +1,4 @@
-import { ColorSwatch, Text, useComputedColorScheme } from "@mantine/core";
+import { Button, ColorSwatch, Flex, Text, useComputedColorScheme } from "@mantine/core";
 import { SettingsInput } from "@/app/components/SettingsInput/SettingsInput";
 import { useState } from "react";
 import { Breadcrumbs } from "@/app/components/Breadcrumbs/Breadcrumbs";
@@ -17,6 +17,7 @@ import { SettingsIcon } from "@/app/components/SettingsIcon/SettingsIcon";
 import { IconBrush, IconHomeCog, IconLogout, IconRefresh } from "@tabler/icons-react";
 import { useLogout } from "@/app/providers/AccountProvider/useLogout";
 import { RosettaPower } from "@/app/components/RosettaPower/RosettaPower";
+import { modals } from "@mantine/modals";
 
 export function MyProfile() {
     const publicKey = usePublicKey();
@@ -28,8 +29,34 @@ export function MyProfile() {
     const navigate = useNavigate();
     const send = useSender();
     const logout = useLogout();
+    const [usernameError, setUsernameError] = useState(false);
+
+    const openProfileModal = (text : string) => {
+        modals.open({
+            centered: true,
+            children: (
+                <>
+                    <Text size="sm">
+                        {text}
+                    </Text>
+                    <Flex align={'center'} justify={'flex-end'}>
+                        <Button style={{
+                            outline: 'none'
+                        }} color={'red'} variant={'subtle'} onClick={() => modals.closeAll()} mt="md">
+                            Close
+                        </Button>
+                    </Flex>
+                </>
+            ),
+            withCloseButton: false
+        });        
+    }
 
     const saveProfileData = () => {
+        if(usernameError) {
+            openProfileModal("You enter invalid username. Username must be a latin chars in lowercase.");
+            return;
+        }
         let packet = new PacketUserInfo();
         packet.setUsername(username);
         packet.setTitle(title);
@@ -70,10 +97,13 @@ export function MyProfile() {
                     <SettingsInput.Default
                         hit="Username"
                         value={username}
+                        onErrorStateChange={(error) => setUsernameError(error)}
                         placeholder="ex. freddie871"
                         onChange={(e) => setUsername(e.target.value)}
+                        regexp={new RegExp(/^([a-z0-9]{5,16})?$/)}
                     ></SettingsInput.Default>
                 </SettingsInput.Group>
+                {usernameError && <Text c={'red'} fz={10} pl={'xs'} mt={3}>Invalid username.</Text>}
                 <SettingsInput.Copy mt={'sm'} hit="Public Key" value={
                     publicKey
                 } placeholder="Public"></SettingsInput.Copy>