josh-fell commented on pull request #19419:
URL: https://github.com/apache/airflow/pull/19419#issuecomment-961869100


   >The old Chinese proverb says: "If you have a problem, introduce regexp - 
you will have two problems". This regexp will be impossible to reason about, 
fix and improve by anyone who will add a different pattern in the future.
   
   Another daily, wisdom nugget presented by @potiuk.
   
   I like the ast tree idea. In #19237 we briefly discussed adding a pre-commit 
hook to validate `catchup=False` was set in example DAGs. Seems like this ast 
approach would yield a hook that kills two birds with one stone too.


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