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How to send BACKSPACE in expect?

I’m trying to automatize some tool, and I have

 spawn  /home/ $path $view
 expect "Please enter correct product number []"
 sleep 2
 send "CX102504r"

Problem is that by default in prompt is added last product number , for example

Please enter correct product number [] CX000001

When I run my expect script in prom is added

Please enter correct product number [] CX000001CX102504

So how I can tell in except that send BACKSPACE (delete) default product number add set only new one in prompt for example , something like




Alternately you could use 25 once — that is Ctrl-U which (for readline editing) removes everything between the cursor and the start of the line.

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