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For example:
$ perl -pe 's/(.)\G/{$1}/g'
abcd
and the result is:
{}{a}{b}{c}{d}
the first period(.) match is zero length. Is this a bug or a feature?
For me the result is “abcd”, because
/(.)\G/gcan never match — how can it match a single character before the current position, starting at the current position?s/\G(.)/{$1}/gon “abcd” produces “{a}{b}{c}{d}”, which is expected.