proc comma {num {sep ,}} {
while {[regsub {^([-+]?\d+)(\d\d\d)} $num "\\1$sep\\2" num]} {}
return $num
}
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proc comma {num {sep ,}} {
while {[regsub {^([-+]?\d+)(\d\d\d)} $num "\\1$sep\\2" num]} {}
return $num
}