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FilledSmallSquare ReplaceAllUnheld[expr, rules] applies a rule or list of rules in an attempt to transform each subpart of expr that would be automatically evaluated.

FilledSmallSquare ReplaceAll operates on all subparts of an expression; ReplaceAllUnheld operates only on those subparts that would normally be evaluated.

FilledSmallSquare Example: Developer`ReplaceAllUnheld[If[a, a, a], a->b] LongRightArrow.

FilledSmallSquare See also: ReplaceAll, Hold, Verbatim.