xuanwubing opened a new issue, #32831:
URL: https://github.com/apache/shardingsphere/issues/32831

   usually, we would comment  our xxx.yml config's key;
   but,if we use placeholder with comment, then the placeholder value must has 
one whitespace after it at least.
   
   This  " _**private static final Pattern PLACEHOLDER_PATTERN = 
Pattern.compile("\\$\\$\\{(.+::.*)}$");**_"  regular expression doesn't support 
any whitespace after placeholder.


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