How to delete items from your command history

:call histdel

histdel({history} [, {item}]) *histdel()*
Clear {history}, i.e. delete all its entries. See |hist-names|
for the possible values of {history}.

If the parameter {item} is given as String, this is seen
as regular expression. All entries matching that expression
will be removed from the history (if there are any).
Upper/lowercase must match, unless "\c" is used |/\c|.
If {item} is a Number, it will be interpreted as index, see
|:history-indexing|. The respective entry will be removed
if it exists.

The result is a Number: 1 for a successful operation,
otherwise 0 is returned.

Examples:
Clear expression register history: >
:call histdel("expr")
<

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