**Summary**
- Fixed Ruby warning about unescaped closing bracket in character class
within `MENTION_REGEX`
- Properly escaped the `]` character in the regex pattern to follow Ruby
regex syntax standards
**Changes**
- Updated `MENTION_REGEX` in `lib/regex_helper.rb` to escape the closing
bracket in character class `[^]]+` → `[^\\]]+`
Fixes notification display issues when user or team names contain emojis
and special characters. Previously, mention notifications would show
URL-encoded characters instead of properly formatted names with emojis.
**Before:**
Notification: "John Doe: Hey @%F0%9F%91%8D%20customer%20support please
check this"
**After:**
Notification: "John Doe: Hey @👍 customer support please check this"
