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Using regular expression in expect script

using regular expression in expect scripts

i wrote expect script that will check string out put of "show clock" command but i want to validate this using regular expression...how i can do validation using expect script & store output from expect command.

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sample expect script

#!/usr/bin/expect -f

set timeout -1
spawn ./Nikcli.sh
expect -exact "\rNik> [m"
set date_var [exec date]

send -- "show clock\r"
expect -exact "$date_var\r
\rNik> "

send -- ""
expect eof

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-Thanks in advance

Use the -indices flag to the expect command, and the -re pattern type option. Then the expect_out variable will be set after a match is found, and sub-expressions in your RE will be available.

From the expect manual page:

Quote:

If a process produced the output "abbbcabkkkka\n", the result of:

Code:

expect -indices -re "b(b*).*(k+)"

is as if the following statements had executed:

Code:

set expect_out(0,start) 1

set expect_out(0,end) 10

set expect_out(0,string) bbbcabkkkk

set expect_out(1,start) 2

set expect_out(1,end) 3

set expect_out(1,string) bb

set expect_out(2,start) 10

set expect_out(2,end) 10

set expect_out(2,string) k

set expect_out(buffer) abbbcabkkkk