Project requirements. Deep web crawler. The input request header can be customized. The front end needs to validate the format of the request header regularly. Its format requires the aura b format, with multiple separated by commas, regardless of its own format with commas, you can use special symbols. Pray for the great god. 
what is the Avram b format?
this is not a regular match
it is recommended to design
input box: add and delete input box
then there will be no problem
if I write a rough pattern in this way, try
^ [^:,]: + | [^:] $
satisfies
1. Do not start with:,
2. Do not end with:
3. There are more than one in the middle:
unsatisfied situation
in the middle,: not in pairs
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