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added 101 characters in body

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edited Jan 7, 2019 at 8:59

Alternatively:

expr /. 
  foo_f :> RuleCondition[Hold[foo] /. Print -> Echo] /. 
  Hold[foo_f] :> foo

We can safely perform the second replacement because we just wrapped every f[..] with Hold.

Alternatively:

expr /. 
  foo_f :> RuleCondition[Hold[foo] /. Print -> Echo] /. 
  Hold[foo_f] :> foo

Alternatively:

expr /. 
  foo_f :> RuleCondition[Hold[foo] /. Print -> Echo] /. 
  Hold[foo_f] :> foo

We can safely perform the second replacement because we just wrapped every f[..] with Hold.

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created Jan 6, 2019 at 20:04

Alternatively:

expr /. 
  foo_f :> RuleCondition[Hold[foo] /. Print -> Echo] /. 
  Hold[foo_f] :> foo