in reply to Re^4: Regular Expressions: Removing 'only' single spaces from a string
in thread Regular Expressions: Removing 'only' single spaces from a string

Won't work for a single space at the beginning or end of the string. To fix: 
$string =~ s/(\S|^)\s(\S|$)/$1$2/g;

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But the lookahead solution is preferable.
Caution: Contents may have been coded under pressure.
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