`Replace`¶

Replaces the entire expression (or a specific level) using a rule. Unlike ReplaceAll, the rule applies to the whole expression by default.

$ wo 'Replace[x + y, x -> a]'
x + y

$ wo 'Replace[{1, 2, 3}, x_ -> x^2, {1}]'
{1, 4, 9}

A second argument that is not a rule is reported, and the call is left unevaluated.

$ wo 'Replace[x, b]'

Replace::reps: {b} is neither a list of replacement rules nor a valid dispatch table and so cannot be used for replacing.
Replace[x, b]

Replace¶

`Replace`¶