Allow Arabic and Cyrillic characters when signing up or creating community (#2780)

* Allow Arabic and Cyrillic characters when signing up or creating community

* Fix mistake with escape

* Another escape mistake

package.json

@@ -145,7 +145,7 @@
       "sortpack"
     ]
   },
-  "packageManager": "pnpm@9.9.0+sha512.60c18acd138bff695d339be6ad13f7e936eea6745660d4cc4a776d5247c540d0edee1a563695c183a66eb917ef88f2b4feb1fc25f32a7adcadc7aaf3438e99c1",
+  "packageManager": "pnpm@9.12.3+sha512.cce0f9de9c5a7c95bef944169cc5dfe8741abfb145078c0d508b868056848a87c81e626246cb60967cbd7fd29a6c062ef73ff840d96b3c86c40ac92cf4a813ee",
   "engineStrict": true,
   "importSort": {
     ".js, .jsx, .ts, .tsx": {

src/shared/components/community/community-form.tsx

@@ -14,6 +14,7 @@ import { ImageUploadForm } from "../common/image-upload-form";
 import { LanguageSelect } from "../common/language-select";
 import { MarkdownTextArea } from "../common/markdown-textarea";
 import { tippyMixin } from "../mixins/tippy-mixin";
+import { validActorRegexPattern } from "../../config";
 
 interface CommunityFormProps {
   community_view?: CommunityView; // If a community is given, that means this is an edit
@@ -129,7 +130,7 @@ export class CommunityForm extends Component<
                 onInput={linkEvent(this, this.handleCommunityNameChange)}
                 required
                 minLength={3}
-                pattern="[a-z0-9_]+"
+                pattern={validActorRegexPattern}
                 title={I18NextService.i18n.t("community_reqs")}
               />
             </div>

src/shared/components/home/signup.tsx

@@ -11,7 +11,7 @@ import {
   LoginResponse,
   SiteView,
 } from "lemmy-js-client";
-import { joinLemmyUrl } from "../../config";
+import { joinLemmyUrl, validActorRegexPattern } from "../../config";
 import { mdToHtml } from "../../markdown";
 import { I18NextService, UserService } from "../../services";
 import {
@@ -166,7 +166,7 @@ export class Signup extends Component<
               onInput={linkEvent(this, this.handleRegisterUsernameChange)}
               required
               minLength={3}
-              pattern="[a-zA-Z0-9_]+"
+              pattern={validActorRegexPattern}
               title={I18NextService.i18n.t("community_reqs")}
             />
           </div>

src/shared/config.ts

@@ -50,3 +50,6 @@ export const instanceLinkRegex = new RegExp(
 );
 
 export const testHost = "0.0.0.0:8536";
+
+export const validActorRegexPattern =
+  "^\\w+|[\\p{Script=Arabic}\\d_]+|[\\p{Script=Cyrillic}\\d_]+$";