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-rw-r--r--synapse/util/stringutils.py4
1 files changed, 1 insertions, 3 deletions
diff --git a/synapse/util/stringutils.py b/synapse/util/stringutils.py
index 2e2b40a426..61d96a6c28 100644
--- a/synapse/util/stringutils.py
+++ b/synapse/util/stringutils.py
@@ -24,9 +24,7 @@ from synapse.api.errors import Codes, SynapseError
 _string_with_symbols = string.digits + string.ascii_letters + ".,;:^&*-_+=#~@"
 
 # https://matrix.org/docs/spec/client_server/r0.6.0#post-matrix-client-r0-register-email-requesttoken
-# Note: The : character is allowed here for older clients, but will be removed in a
-# future release. Context: https://github.com/matrix-org/synapse/issues/6766
-client_secret_regex = re.compile(r"^[0-9a-zA-Z\.\=\_\-\:]+$")
+client_secret_regex = re.compile(r"^[0-9a-zA-Z\.\=\_\-]+$")
 
 # random_string and random_string_with_symbols are used for a range of things,
 # some cryptographically important, some less so. We use SystemRandom to make sure