Test variable substitution

Test for variable substitution

Click "Refersh" to refresh the card, and the varaible references in the card will be substitued
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set hi = "hello", name = " Yi chao"
, => ,
, => ,
, => ,
, => ,

set name2 = $(name:e)
, => ,
,$(name:e) => ,$(name:e)

set name3 = $(name2:u)
, => ,
, => ,