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diff --git a/plugins/autocorrect.py b/plugins/autocorrect.py
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+"""
+This plugin lets you perform simple replacements on the last message.
+
+Installation
+------------
+
+Load the plugin::
+
+    /load autocorrect
+
+Usage
+-----
+
+.. note:: This plugin only performs *simple* replacements, not with
+    regular expressions, despite the syntax. Although it would be
+    possible, that would be even less useful.
+
+Once the plugin is loaded, any message matching the following regex::
+
+    ^s/(.+?)/(.*?)(/|/g)?$
+
+will be interpreted as a replacement, and the substitution will be
+applied to the last sent message.
+
+For example, if you sent the message::
+
+    This tab lists all public rooms on a MUC service. It is currently very limited but will be improved in the future. There currently is no way to search a room.
+
+And you now want to replace “MUC” with “multi-user chat”, you input::
+
+    s/MUC/multi-user chat
+
+And poezio will correct the message for you.
+"""
+
+from plugin import BasePlugin
+import re
+
+sed_re = re.compile('^s/(.+?)/(.*?)(/|/g)?$')
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.api.add_event_handler('muc_say', self.sed_fix)
+        self.api.add_event_handler('conversation_say', self.sed_fix)
+        self.api.add_event_handler('private_say', self.sed_fix)
+
+    def sed_fix(self, msg, tab):
+        if not tab.last_sent_message:
+            return
+        body = tab.last_sent_message['body']
+        match = sed_re.match(msg['body'])
+        if not match:
+            return
+        remove, put, matchall = match.groups()
+
+        replace_all = False
+        if matchall == '/g':
+            replace_all = True
+
+        if replace_all:
+            new_body = body.replace(remove, put)
+        else:
+            new_body = body.replace(remove, put, 1)
+
+        if body != new_body:
+            msg['body'] = new_body
+            msg['replace']['id'] = tab.last_sent_message['id']