fork download 
  1. import re
  2.  
  3. pattern = r"[#@&$]a[#@&$](?<!@a\$)"
  4. print(re.findall(pattern,'something#a&others@a$'))
Success #stdin #stdout 0.03s 9480KB
comments (?)
stdin 
Standard input is empty
stdout 
['#a&']
https://ideone.com/tGlkcF
language:
Python 3 (python  3.12)
created:
4 years ago
visibility:
public

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