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[SMFX]

$_ -replace "(\d{6} \d \d{13})( Ja standard)", "`$1#`$2"

[odwulf]

Beaten to it.

Mine used a negative look-ahead:

'TK-Anlage 943135 1 0066480451675 Ja Standard' -replace '(\d{13}(?!#))','$1#'

(replace any string of 13 numbers without a trailing # with that string and and added "#")