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-rw-r--r--synapse/appservice/__init__.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/appservice/__init__.py b/synapse/appservice/__init__.py
index 48791f0d9b..7346206bb1 100644
--- a/synapse/appservice/__init__.py
+++ b/synapse/appservice/__init__.py
@@ -127,7 +127,7 @@ class ApplicationService(object):
                     )
                 regex = regex_obj.get("regex")
                 if isinstance(regex, basestring):
-                    regex_obj["regex"] = re.compile(regex)
+                    regex_obj["regex"] = re.compile(regex)  # Pre-compile regex
                 else:
                     raise ValueError(
                         "Expected string for 'regex' in ns '%s'" % ns