SubsetReplace

SubsetReplace[list, rules] replaces sublists in list according to the specified rule or list of rules.

• SubsetReplace[list, rules, n] does only the first n replacements.
• SubsetReplace[rules] represents an operator form of SubsetReplace that can be applied to an expression.

Examples

SubsetReplace[{1, 2, 3, 4}, {1, 2} -> x]

SubsetReplace[{a, b, c, b, c, d}, {b, c} -> z, 1]

Please visit the official Wolfram Language Reference for more details.