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  1. import re
  2.  
  3. print(re.sub(r"<(\w+)[^>]*>((?!<\/\1>).)*<\/\1>", r"@\1", input()))
Success #stdin #stdout 0.03s 9480KB
stdin
<MUTATION value=123>123</MUTATION> has increased <EFFECT>something something</EFFECT>
stdout
@MUTATION has increased @EFFECT