Based on the data you've provided, s[(\s{2})(?=\d)][2]g should do what you want.
Or (more simply, IMHO) use \h [horizontal whitespace] instead of \s

In reply to Re^2: Perl regex. Why does this happen? by OneTrueDabe
in thread Perl regex. Why does this happen? by $h4X4_|=73}{

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