Course of Raku / Regexes and grammars / Regexes / Substitution and replacement / Exercises / Mask the digits

Solution: Mask the digits

Here is a possible solution to the task.

Code

my $orig = 'PIN 1234';
say S:g/\d/#/ given $orig;
say $orig;

🦋 You can find the source code in the file mask-digits.raku.

Output

PIN ####
PIN 1234

Comments

The uppercase S/// does the same job as s/// but returns a new string instead of changing the variable in place. With :g it replaces every digit \d with a # in the returned copy. It is applied to $orig with given, which sets the string as the topic.
Printing $orig afterwards shows it still holds PIN 1234 — unlike s///, the original was left untouched.

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