DeleteCases

list with every top-level element matching pattern removed.

✓ checked against that system · ! checked, with disagreements (hover a chip)Wolfram LanguageDeleteCases✓↗

DeleteCases(list, pattern)the elements of list that do NOT match pattern

Typed signatures

Type	Package	Applies
(any, any) -> any	combinatorics	always

Domain: Collections

Details

• Top level only — Wolfram's optional levelspec/n (search below the top, cap how many to delete) aren't implemented.
• Built on the same match primitive as MatchQ and FreeQ, so it shares their wildcard grammar and their limits.
• A string-literal pattern inherits a compute-engine quirk: two EQUAL string literals don't count as a match (MatchQ already answers False for it), so DeleteCases won't remove them either — not something patched around here.

Examples

Basic #

live ↗

In$\mathrm{DeleteCases}(\bigl\lbrack1, 2, 3, 2, 4\bigr\rbrack, 2)$Out$\bigl\lbrack1, 3, 4\bigr\rbrack$

Scope #

live ↗

In$\mathrm{DeleteCases}(\bigl\lbrack x, y, z\bigr\rbrack, \operatorname{\_a})$Out$\bigl\lbrack\bigr\rbrack$

About

Examples	2
Checked against	Wolfram Language 1 agree
Crosswalk	Wolfram Language

See also: MatchQ, FreeQ, Pick