Trying to troubleshoot an SFTP script that uses Expect

You best try to run the command and see whether the expect should be in the form that you are looking which is explicit and exact where a simple
expect "password: " 

note the response is commonly ended with a space also adding unnecessary ....

use single quotes or you have to escape the & another option is to assign these to a variable first
username='username@ftpprd.host.com'
password='r10@4g@$^#a&r*a^^$%'

spawn sftp $username
expect 'password: '
send "$password"
expect 'sftp> '
#connection established do stuff.

it you can use an ip address it would be better.
on expect, you can use only the last characters, not the entire prompt.
on the password i use \r instead of \n

#!/usr/bin/expect
spawn sftp username@ipaddress
expect "assword: "
send "r10@4g@$^#a&r*a^^$%\r"

In Expect (or Tcl in general) text in braces ({}) does not require escaping, whereas text in double-quotes does. So in https:#a42676112, substitute send {r10@4g@$^#a&r*a^^$%}; send \r
While debugging, you also might like to insert exp_internal 1 near the start of your script. This will confirm to you what is being sent, and also shows what comes back.

Thanks - I'm having a weird, different issue:  The script seems to be sending the right data, but the commands aren't getting executed in SFTP.  At the end of the script I'm trying to do an 'ls' and a 'put', but neither command is getting executed.  Can I get another hint?
 
Sample output below (I set exp_internal 1 to show me the inputs and outputs, and changed the server names / passwords)

danp@qvarzpcldb03:~$ ./sftp2.sh
spawn sftp 0725@ftpprd.bank.com
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {116608}

expect: does "" (spawn_id exp5) match glob pattern "assword: "? no
Connecting to ftpprd.bank.com...

expect: does "Connecting to ftpprd.bank.com...\r\n" (spawn_id exp5) match glob pattern "assword: "? no
Access to this site is entirely prohibited unless permission has been granted.

expect: does "Connecting to ftpprd.bank.com...\r\nAccess to this site is entirely prohibited unless permission has been granted.\r\n" (spawn_id exp5) match glob pattern "assword: "? no
Authenticated with partial success.

expect: does "Connecting to ftpprd.bank.com...\r\nAccess to this site is entirely prohibited unless permission has been granted.\r\nAuthenticated with partial success.\r\r\n" (spawn_id exp5) match glob pattern "assword: "? no
0725@ftpprd.bank.com's password:
expect: does "Connecting to ftpprd.bank.com...\r\nAccess to this site is entirely prohibited unless permission has been granted.\r\nAuthenticated with partial success.\r\r\0725@ftpprd.bank.com's password: " (spawn_id exp5) match glob pattern "assword: "? yes
expect: set expect_out(0,string) "assword: "
expect: set expect_out(spawn_id) "exp5"
expect: set expect_out(buffer) "Connecting to ftpprd.bank.com...\r\nAccess to this site is entirely prohibited unless permission has been granted.\r\nAuthenticated with partial success.\r\r\n0725@ftpprd.bank.com's password: "
send: sending "some@$#p&h*apassword" to { exp5 }
send: sending "ls" to { exp5 }
send: sending "bye" to { exp5 }


Script is here:
#!/usr/bin/expect
exp_internal 1
spawn sftp 0725@ftpprd.bank.com
expect "assword: "
send "some@$#p&h*assword\r"
send "put /home/danp/test1.txt"
send "ls"
send "bye"

Thank you for your help!

-Dan