[PLT-7342] Add function and tests to specifically determine @all & @channel (#7181)

* add function and tests to specifically determine @all & @channel

* uodate per comments - regex and tests

webapp/components/create_post.jsx

@@ -14,6 +14,7 @@ import * as EmojiPicker from 'components/emoji_picker/emoji_picker.jsx';
 import AppDispatcher from 'dispatcher/app_dispatcher.jsx';
 import * as GlobalActions from 'actions/global_actions.jsx';
 import * as Utils from 'utils/utils.jsx';
+import * as PostUtils from 'utils/post_utils.jsx';
 import * as UserAgent from 'utils/user_agent.jsx';
 import * as ChannelActions from 'actions/channel_actions.jsx';
 import * as PostActions from 'actions/post_actions.jsx';
@@ -224,7 +225,7 @@ export default class CreatePost extends React.Component {
         const members = stats.member_count - 1;
         const updateChannel = ChannelStore.getCurrent();
 
-        if ((this.state.message.includes('@all') || this.state.message.includes('@channel')) && members >= Constants.NOTIFY_ALL_MEMBERS) {
+        if ((PostUtils.containsAtMention(this.state.message, '@all') || PostUtils.containsAtMention(this.state.message, '@channel')) && members >= Constants.NOTIFY_ALL_MEMBERS) {
             this.setState({totalMembers: members});
             this.showNotifyAllModal();
             return;

webapp/tests/utils/post_utils.test.jsx

@@ -0,0 +1,97 @@
+import * as PostUtils from 'utils/post_utils.jsx';
+
+describe('PostUtils.containsAtMention', function() {
+    test('should return correct @all (same for @channel)', function() {
+        for (const data of [
+            {
+                text: undefined,    //eslint-disable-line no-undefined
+                key: undefined,     //eslint-disable-line no-undefined
+                result: false
+            },
+            {
+                text: '',
+                key: '',
+                result: false
+            },
+            {
+                text: 'all',
+                key: '@all',
+                result: false
+            },
+            {
+                text: '@allison',
+                key: '@all',
+                result: false
+            },
+            {
+                text: '@ALLISON',
+                key: '@all',
+                result: false
+            },
+            {
+                text: '@all123',
+                key: '@all',
+                result: false
+            },
+            {
+                text: '123@all',
+                key: '@all',
+                result: false
+            },
+            {
+                text: 'hey@all',
+                key: '@all',
+                result: false
+            },
+            {
+                text: 'hey@all.com',
+                key: '@all',
+                result: false
+            },
+            {
+                text: '@all',
+                key: '@all',
+                result: true
+            },
+            {
+                text: '@ALL',
+                key: '@all',
+                result: true
+            },
+            {
+                text: '@all hey',
+                key: '@all',
+                result: true
+            },
+            {
+                text: 'hey @all',
+                key: '@all',
+                result: true
+            },
+            {
+                text: 'HEY @ALL',
+                key: '@all',
+                result: true
+            },
+            {
+                text: 'hey @all!',
+                key: '@all',
+                result: true
+            },
+            {
+                text: 'hey @all:+1:',
+                key: '@all',
+                result: true
+            },
+            {
+                text: 'hey @ALL:+1:',
+                key: '@all',
+                result: true
+            }
+        ]) {
+            const containsAtMention = PostUtils.containsAtMention(data.text, data.key);
+
+            expect(containsAtMention).toEqual(data.result);
+        }
+    });
+});

webapp/utils/post_utils.jsx

@@ -107,3 +107,12 @@ export function shouldShowDotMenu(post) {
 
     return false;
 }
+
+export function containsAtMention(text, key) {
+    if (!text || !key) {
+        return false;
+    }
+
+    // This doesn't work for at mentions containing periods or hyphens
+    return new RegExp(`\\B${key}\\b`, 'i').test(text);
+}