diff --git a/README.md b/README.md
index f8e50ce..ddc9e41 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/352635b2c8534b0086b5a153db7c82e9)](https://app.codacy.com/gh/BoYanZh/Joint-Teapot?utm_source=github.com&utm_medium=referral&utm_content=BoYanZh/Joint-Teapot&utm_campaign=Badge_Grade_Settings)
 
-A handy tool for TAs in JI to handle works through [Gitea](https://focs.ji.sjtu.edu.cn/git/), [Canvas](https://umjicanvas.com/), and [JOJ](https://joj.sjtu.edu.cn/). Joint is related to JI and also this tool which join websites together. Teapot means to hold Gitea, inspired by [@nichujie](https://github.com/nichujie).
+A handy tool for TAs in JI to handle works through [Gitea](https://focs.ji.sjtu.edu.cn/git/), [Canvas](https://umjicanvas.com/), [JOJ](https://joj.sjtu.edu.cn/) and [Mattermost](https://focs.ji.sjtu.edu.cn/mm/). Joint is related to JI and also this tool which join websites together. Teapot means to hold Gitea, inspired by [@nichujie](https://github.com/nichujie).
 
 This tool is still under heavy development. The docs may not be updated on time, and all the features are provided with the probability to change.
 
@@ -85,6 +85,11 @@ invite all canvas students to gitea teams by team name
 ### `prepare-assignment-dir`
 prepare assignment dir from extracted canvas "Download Submissions" zip
 
+### `unsubscribe-from-repos`
+Unsubscribe from all repos in the organization specified in the config file where the repo name matches a given regex expression.
+
+Example: `python3 -m joint_teapot unsubscribe-from-repos '\d{12}$'` will remove all repos whose names end with a student ID number from your gitea subscription list. Refer to the Python `re` module docs for more info about regex.
+
 ### `upload-assignment-grades`
 upload assignment grades to canvas from grade file (GRADE.txt by default), read the first line as grade, the rest as comments
 
diff --git a/joint_teapot/app.py b/joint_teapot/app.py
index e25f2cf..9c3bed7 100644
--- a/joint_teapot/app.py
+++ b/joint_teapot/app.py
@@ -165,6 +165,14 @@ def create_webhooks_for_mm(prefix: str = Argument("")) -> None:
     tea.pot.mattermost.create_webhooks_for_repos(repo_names, tea.pot.gitea)
 
 
+@app.command(
+    "unsubscribe-from-repos",
+    help="unsubscribe from all repos whose name match the given regex pattern",
+)
+def unsubscribe_from_repos(pattern: str = Argument("")) -> None:
+    tea.pot.gitea.unsubscribe_from_repos(pattern)
+
+
 if __name__ == "__main__":
     try:
         app()
diff --git a/joint_teapot/workers/gitea.py b/joint_teapot/workers/gitea.py
index 0b4c485..40b817a 100644
--- a/joint_teapot/workers/gitea.py
+++ b/joint_teapot/workers/gitea.py
@@ -1,3 +1,4 @@
+import re
 from datetime import datetime
 from enum import Enum
 from functools import lru_cache
@@ -397,6 +398,25 @@ class Gitea:
             res[team.name] = members
         return res
 
+    def unsubscribe_from_repos(self, pattern: str) -> None:
+        subscriptions = [
+            sub
+            for sub in self.user_api.user_current_list_subscriptions()
+            if sub.owner.login == self.org_name
+            and re.search(pattern, sub.name) is not None
+        ]
+        if len(subscriptions) == 0:
+            logger.warning(f"No subscribed repo matches the pattern {pattern}")
+            return
+        logger.info(
+            f"{len(subscriptions)} subscriptions match the pattern {pattern}: {[s.name for s in subscriptions]}"
+        )
+        for sub in subscriptions:
+            self.repository_api.user_current_delete_subscription(
+                self.org_name, sub.name
+            )
+            logger.info(f"Unsubscribed from {sub.name}")
+
 
 if __name__ == "__main__":
     gitea = Gitea()