• ← ReplaceAll
• → ReplaceRepeated

ReplaceList

WMA link

ReplaceList[expr, rules]

returns a list of all possible results when applying rules to expr.

ReplaceList[expr, rules, n]

returns a list of at most n results when applying rules to expr.

Get all subsequences of a list:

• • ReplaceList[{a, b, c}, {___, x__, ___} -> {x}]

You can specify the maximum number of items:

• • ReplaceList[{a, b, c}, {___, x__, ___} -> {x}, 3]

• • ReplaceList[{a, b, c}, {___, x__, ___} -> {x}, 0]

If no rule matches, an empty list is returned:

• • ReplaceList[a, b->x]

Like in ReplaceAll, rules can be a nested list:

• • ReplaceList[{a, b, c}, {{{___, x__, ___} -> {x}}, {{a, b, c} -> t}}, 2]

Possible matches for a sum:

• • ReplaceList[a + b + c, x_ + y_ -> {x, y}]