It is documented. perldoc perlre
    The numbered match variables ($1, $2, $3, etc.) and the related
    punctuation set ($+, $&, $`, $', and $^N) are all dynamically scoped
    until the end of the enclosing block or until the next successful match,
    whichever comes first. (See "Compound Statements" in perlsyn.)

In reply to Re^5: Regular Expressions by Anonymous Monk
in thread Regular Expressions by y8

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