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s/ / /
Combined from primary sources listed below.

In Regexes§

See primary documentation in context for Lexical conventions.

Substitutions are written similarly to matching, but the substitution operator has both an area for the regex to match, and the text to substitute:

s/replace/with/;           # a substitution that is applied to $_
$str ~~ s/replace/with/;   # a substitution applied to a scalar

The substitution operator allows delimiters other than the slash:

s|replace|with|;
s!replace!with!;
s,replace,with,;

Note that neither the colon : nor balancing delimiters such as {} or () can be substitution delimiters. Colons clash with adverbs such as s:i/Foo/bar/ and the other delimiters are used for other purposes.

If you use balancing curly braces, square brackets, or parentheses, the substitution works like this instead:

s[replace] = 'with';

The right-hand side is now a (not quoted) Raku expression, in which $/ is available as the current match:

$_ = 'some 11 words 21';
s:g[ \d+ ] =  2 * $/;
.say;                    # OUTPUT: «some 22 words 42␤»

Like the m// operator, whitespace is ignored in the regex part of a substitution.