You could fix your original code less invasively with

s/(?<!^)([A-Z])/ $1/g;

[download]

But [A-Z] only works for English, at most, and should be avoided.

s/(?<!^)(\p{Upper})/ $1/g;

[download]

Makeshifts last the longest.

In reply to Re^2: Insert Space between names by Aristotle
in thread Insert Space between names by steelrose

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