lordcheng10 commented on PR #17151:
URL: https://github.com/apache/pulsar/pull/17151#issuecomment-1243612239

   @Jason918 @codelipenghui @massakam  @equanz  PTAL,thanks! 
   
   The ASCII values of invisible characters are 0~32 and 127. Added a method 
org.apache.pulsar.utils.StringUtil#invisibleCharacters to check if the 
subscription name contains invisible characters.


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