Pexpect正则表达式不起作用

Question

I am having a script which uses pexpect to telnet to a switch and copy its running config to a tftp server. If I give the hostname, then the script works fine but while using regex in pexect, timeout occurs. The code is as follows:

child = pexpect.spawn('telnet ' +ip)
child.expect ('Login: ')
child.sendline (username)
child.expect ('Password: ')
child.sendline (password)
child.sendline ('enable')
child.expect('Password: ')
child.sendline(password)
child.expect('.*\-.*#')
child.sendline ('copy running-config tftp://10.0.37.111/'+filename+'.txt')
time.sleep(5)

I am giving the above regex as the hostname for my current switch is Force10-60. Thanks.

Answer 1

child.expect(r'.+\-.+#')

You can try this by providing raw string .

Or use

child.expect('#')

To match any hostname

Answer 2

I know this question already has accepted answer but I would like to add an explanation on how to handle matched regular expression.

So, my problem was that I needed to get a string that appeared between two specific strings. This is how I solved my problem:

import pexpect

child = pexpect.spawn(...)
child.sendline(...)
child.expect(r'firstString(.*?)secondString')

regex_obj = child.match
print(regex_obj.group(1).decode('utf-8'))

Hope this would help someone!