SEARCH MATHEMATICA 8 DOCUMENTATION

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Developer Package Symbol

ReplaceAllUnheld

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

To use ReplaceAllUnheld, you first need to load the Developer Utilities Package using Needs["Developer`"].

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