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ReplaceAll

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Replaces parts of an expression according to rules.

expr /. rules or ReplaceAll[expr, rules]
ReplaceAll[rules]
{a, b} /. a -> x → {x, b}{x^2, y^2} /. x -> 2 → {4, y^2}(# + 1) &[2] /. 3 -> 9 → 9

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