Answer Posted / asmara

translate(Rtrim(Ltrim(substr(col_1,1,6))),'$',0123456789')
=''

thru leading (LTRIM) and Trailing (RTRIM) spaces from the
substring, then translates embedded spaces to $ and digits
to spaces and leaves any other char unchanged, then checks
to be sure there is nothing but spaces left. We can say
that we are checking the substring contains only numberic
digits, optionally with leading and/or trailing spaces.

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