But it is documented.

But when EXPR is one of the below exceptional cases, it is used directly as a boolean:

• [...]
• a regular expression match, i.e. /REGEX/ or $foo =~ /REGEX/, or a negated regular expression match (!/REGEX/ or $foo !~ /REGEX/).
• [...]

It makes sense. It allows

given ($x) {
   when (/abc/) { ... }
   when (/def/) { ... }
   when (/ghi/) { ... }
}
[download]

to mean

if    ($x =~ /abc/) { ... }
elsif ($x =~ /def/) { ... }
elsif ($x =~ /ghi/) { ... }
[download]

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