Tcl期望：變量發送對複雜認證提示的響應

Question

這是摘自已知與Telnet服務器一起工作的TCL腳本的相關部分。

#!/bin/sh 
# \ 
exec tclsh "$0" ${1+"$@"} 
package require Expect 
#USER 
set user xyz 
set secret 12345678 
set smr AB1CDE-11 
set host foo.bar 
#TELNET START 
spawn telnet $host 
expect "\[Login :\]" 
send "$user\r"; 
expect "=>" 
#RMS 
send "c $smr gate\r"; 
expect "$smr >" 
send "PW $secret\r" 
expect "\[>\]" 

幾天前登錄過程發生了變化。無法與send "PW $secret\r"聯繫。在$smr >響應之後，可發送任何命令以發起登錄，例如， send "login\r"。 telnet迴應Login [517]:。 []內的數字對應於$secret中的位置。完整的$secrect響應不再成功。服務器需要一個包含全部三個字符和三個附加字符的響應。

出於某些原因，我希望$secret中字符的位置處於三個隨機字符（RegEx字詞中的可能字符：[A-Z0-9.!@#$%^&*()_]）之間的隨機位置。 $secret的長度是可變的。所以我無法爲每個角色設置一個變量來響應他們的RegEx匹配結果。

正確的RegExp捕獲字符的位置將是LOGIN \[(\d)(\d)(\d)]:，對不對？我已經得到了以下內容（由於我正在評估登錄過程的隨機性，所以輸出在統計後處理的文本文件中被捕獲）。

send "login\r"  
set input [open output_$user.txt a] 
set output $expect_out(buffer) 
puts $input $output 
close $input 
expect "LOGIN" 
#Check LOGIN prompt 
set file [read [open "output_$user.txt" r]] 
if [ 
regexp -nocase {LOGIN \[(\d)(\d)(\d)]:} 
] then { 
send "RESPONSE\r"; 
} 

我該如何解決TCL的問題？謝謝！

Ammendment：
連接到Telnet服務器與send "c $smr gate\r";

XYZ SMC via AB1CDE-11 > 

被回答後，目前正由expect "$smr >"預期。在此之前，一切正常。
以下send "login\r"，Telnet服務器與兩行回覆：

Login [517]: 
XYZ SMC via AB1CDE-11 > 

匹配正則表達式將是Login \[(\d)(\d)(\d)\]:\n.*>。 我已經嘗試了不同的期待正則表達式語法：
多納爾共枕expect -re {Login \[(\d)(\d)(\d)\]:}崩潰TCL的
expect -re -n {Login \[(\d)(\d)(\d)\]:\n.*>} TCL的崩潰
expect {-re -n "Login \[(\d)(\d)(\d)\]:"}出口
只有一些不正規表達式（-re）像expect "$smr >"或expect "LOGIN"作品，以及TCL一點兒也不出口。
TCL程序兼容性（文件夾的路徑已經被匿名）：

<?xml version="1.0" encoding="UTF-16"?> 
<DATABASE> 
<EXE NAME="tclsh.exe" FILTER="GRABMI_FILTER_PRIVACY"> 
    <MATCHING_FILE NAME="base-tcl8.6-thread-win32-ix86.dll" SIZE="2023820" CHECKSUM="0xFCEB4A60" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tcl DLL" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tcl 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tcl86.dll" LEGAL_COPYRIGHT="Copyright © 2001 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x1693A0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 23:56:02" UPTO_LINK_DATE="03/12/2015 23:56:02" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="base-tcl8.6-thread-win32-ix86.exe" SIZE="2445716" CHECKSUM="0x2B1899DD" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tclsh Application" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tcl 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tclsh86s.exe" LEGAL_COPYRIGHT="Copyright © 2000 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x1" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 23:41:45" UPTO_LINK_DATE="03/12/2015 23:41:45" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="base-tk8.6-thread-win32-ix86.exe" SIZE="3713462" CHECKSUM="0xB94B598D" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="ActiveState Basekit" COMPANY_NAME="ActiveState Software Inc." PRODUCT_NAME="TDK Basekit 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="basekit.exe" LEGAL_COPYRIGHT="Copyright © 2009 by ActiveState Software Inc." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 23:46:01" UPTO_LINK_DATE="03/12/2015 23:46:01" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="tcl86.dll" SIZE="1228800" CHECKSUM="0x3BC33EBF" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tcl DLL" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tcl 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tcl86.dll" LEGAL_COPYRIGHT="Copyright © 2001 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x12F33A" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 22:59:49" UPTO_LINK_DATE="03/12/2015 22:59:49" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="tclsh.exe" SIZE="393216" CHECKSUM="0x9050007E" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tclsh Application" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tcl 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tclsh86.exe" LEGAL_COPYRIGHT="Copyright © 2000 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x1" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 22:59:57" UPTO_LINK_DATE="03/12/2015 22:59:57" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="tclsh86.exe" SIZE="393216" CHECKSUM="0x9050007E" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tclsh Application" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tcl 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tclsh86.exe" LEGAL_COPYRIGHT="Copyright © 2000 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x1" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 22:59:57" UPTO_LINK_DATE="03/12/2015 22:59:57" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="teacup.exe" SIZE="3259545" CHECKSUM="0xFDE41297" BIN_FILE_VERSION="8.5.2.18" BIN_PRODUCT_VERSION="8.5.2.18" PRODUCT_VERSION="8.5.18" FILE_DESCRIPTION="Tclsh Application" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tcl 8.5 for Windows" FILE_VERSION="8.5.18" ORIGINAL_FILENAME="tclsh85s.exe" LEGAL_COPYRIGHT="Copyright © 2000 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x1" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.5.2.18" UPTO_BIN_PRODUCT_VERSION="8.5.2.18" LINK_DATE="03/12/2015 04:34:28" UPTO_LINK_DATE="03/12/2015 04:34:28" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="tk86.dll" SIZE="1433600" CHECKSUM="0x9963D526" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tk DLL" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tk 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tk86.dll" LEGAL_COPYRIGHT="Copyright © 2001 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x162A03" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 23:31:57" UPTO_LINK_DATE="03/12/2015 23:31:57" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="wish.exe" SIZE="393216" CHECKSUM="0x4A8216DD" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Wish Application" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tk 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="wish86.exe" LEGAL_COPYRIGHT="Copyright © 2000 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x1" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 23:31:58" UPTO_LINK_DATE="03/12/2015 23:31:58" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="wish86.exe" SIZE="393216" CHECKSUM="0x4A8216DD" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Wish Application" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tk 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="wish86.exe" LEGAL_COPYRIGHT="Copyright © 2000 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x1" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 23:31:58" UPTO_LINK_DATE="03/12/2015 23:31:58" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="zlib1.dll" SIZE="107520" CHECKSUM="0x6E91C07D" BIN_FILE_VERSION="1.2.8.0" BIN_PRODUCT_VERSION="1.2.8.0" PRODUCT_VERSION="1.2.8" FILE_DESCRIPTION="zlib data compression library" PRODUCT_NAME="zlib" FILE_VERSION="1.2.8" ORIGINAL_FILENAME="zlib1.dll" INTERNAL_NAME="zlib1.dll" LEGAL_COPYRIGHT="(C) 1995-2013 Jean-loup Gailly &amp; Mark Adler" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x20A00" LINKER_VERSION="0x10000" UPTO_BIN_FILE_VERSION="1.2.8.0" UPTO_BIN_PRODUCT_VERSION="1.2.8.0" LINK_DATE="05/13/2013 12:42:08" UPTO_LINK_DATE="05/13/2013 12:42:08" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="FOLDER\freewrap.exe" SIZE="8674276" CHECKSUM="0x87EABBB8" MODULE_TYPE="WIN32" PE_CHECKSUM="0x347472" LINKER_VERSION="0x10000" LINK_DATE="02/22/1970 08:06:24" UPTO_LINK_DATE="02/22/1970 08:06:24" /> 
    <MATCHING_FILE NAME="FOLDER\freewrap664\win32\freewrap.exe" SIZE="8674276" CHECKSUM="0x87EABBB8" MODULE_TYPE="WIN32" PE_CHECKSUM="0x347472" LINKER_VERSION="0x10000" LINK_DATE="02/22/1970 08:06:24" UPTO_LINK_DATE="02/22/1970 08:06:24" /> 
    <MATCHING_FILE NAME="FOLDER\freewrap664\win32\freewrapTCLSH.exe" SIZE="5935627" CHECKSUM="0x4728114A" MODULE_TYPE="WIN32" PE_CHECKSUM="0x1E8C2F" LINKER_VERSION="0x10000" LINK_DATE="07/04/1971 17:12:48" UPTO_LINK_DATE="07/04/1971 17:12:48" /> 
    <MATCHING_FILE NAME="FOLDER\freewrap664\win64\freewrap.exe" SIZE="9044047" CHECKSUM="0xEAAC5906" MODULE_TYPE="WIN32" PE_CHECKSUM="0x3406BC" LINKER_VERSION="0x0" LINK_DATE="01/19/2015 01:41:48" UPTO_LINK_DATE="01/19/2015 01:41:48" /> 
    <MATCHING_FILE NAME="FOLDER\freewrap664\win64\freewrapTCLSH.exe" SIZE="6025630" CHECKSUM="0xD1018E6A" MODULE_TYPE="WIN32" PE_CHECKSUM="0x1D252E" LINKER_VERSION="0x0" LINK_DATE="01/15/2015 01:21:20" UPTO_LINK_DATE="01/15/2015 01:21:20" /> 
    <MATCHING_FILE NAME="FOLDER\kit\tclkit.exe" SIZE="1334267" CHECKSUM="0xEFE507F5" BIN_FILE_VERSION="8.5.2.9" BIN_PRODUCT_VERSION="8.5.2.9" PRODUCT_VERSION="8.5.9" FILE_DESCRIPTION="Tclkit, a standalone runtime for Tcl/Tk" COMPANY_NAME="Equi4 Software" PRODUCT_NAME="Tclkit 8.5 for Windows" FILE_VERSION="8.5.9" ORIGINAL_FILENAME="tclkit-gui.exe" LEGAL_COPYRIGHT="Copyright © 1989-2009 by J.Ousterhout et al." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.5.2.9" UPTO_BIN_PRODUCT_VERSION="8.5.2.9" LINK_DATE="09/09/2010 09:22:14" UPTO_LINK_DATE="09/09/2010 09:22:14" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="FOLDER\kit\tclkit2.exe" SIZE="1334267" CHECKSUM="0xEFE507F5" BIN_FILE_VERSION="8.5.2.9" BIN_PRODUCT_VERSION="8.5.2.9" PRODUCT_VERSION="8.5.9" FILE_DESCRIPTION="Tclkit, a standalone runtime for Tcl/Tk" COMPANY_NAME="Equi4 Software" PRODUCT_NAME="Tclkit 8.5 for Windows" FILE_VERSION="8.5.9" ORIGINAL_FILENAME="tclkit-gui.exe" LEGAL_COPYRIGHT="Copyright © 1989-2009 by J.Ousterhout et al." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.5.2.9" UPTO_BIN_PRODUCT_VERSION="8.5.2.9" LINK_DATE="09/09/2010 09:22:14" UPTO_LINK_DATE="09/09/2010 09:22:14" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
    <MATCHING_FILE NAME="FOLDER\kit\tclkit864.exe" SIZE="3933431" CHECKSUM="0x717476F1" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tclkit, a standalone runtime for Tcl/Tk" COMPANY_NAME="Equi4 Software" PRODUCT_NAME="Tclkit 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tclkit-gui.exe" LEGAL_COPYRIGHT="Copyright © 1989-2009 by J.Ousterhout et al." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x0" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="04/12/2015 23:13:37" UPTO_LINK_DATE="04/12/2015 23:13:37" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
</EXE> 
<EXE NAME="tcl86.dll" FILTER="GRABMI_FILTER_THISFILEONLY"> 
    <MATCHING_FILE NAME="tcl86.dll" SIZE="1228800" CHECKSUM="0x3BC33EBF" BIN_FILE_VERSION="8.6.2.4" BIN_PRODUCT_VERSION="8.6.2.4" PRODUCT_VERSION="8.6.4" FILE_DESCRIPTION="Tcl DLL" COMPANY_NAME="ActiveState Corporation" PRODUCT_NAME="Tcl 8.6 for Windows" FILE_VERSION="8.6.4" ORIGINAL_FILENAME="tcl86.dll" LEGAL_COPYRIGHT="Copyright © 2001 by ActiveState Corporation, et al" VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x4" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x12F33A" LINKER_VERSION="0x0" UPTO_BIN_FILE_VERSION="8.6.2.4" UPTO_BIN_PRODUCT_VERSION="8.6.2.4" LINK_DATE="03/12/2015 22:59:49" UPTO_LINK_DATE="03/12/2015 22:59:49" VER_LANGUAGE="Englisch (USA) [0x409]" /> 
</EXE> 
<EXE NAME="kernel32.dll" FILTER="GRABMI_FILTER_THISFILEONLY"> 
    <MATCHING_FILE NAME="kernel32.dll" SIZE="1067008" CHECKSUM="0xD3859AE" BIN_FILE_VERSION="5.1.2600.6532" BIN_PRODUCT_VERSION="5.1.2600.6532" PRODUCT_VERSION="5.1.2600.6532" FILE_DESCRIPTION="Client-DLL für Windows NT-Basis-API" COMPANY_NAME="Microsoft Corporation" PRODUCT_NAME="Betriebssystem Microsoft® Windows®" FILE_VERSION="5.1.2600.6532 (xpsp_sp3_qfe.140312-0419)" ORIGINAL_FILENAME="kernel32" INTERNAL_NAME="kernel32" LEGAL_COPYRIGHT="© Microsoft Corporation. Alle Rechte vorbehalten." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x40004" VERFILETYPE="0x2" MODULE_TYPE="WIN32" PE_CHECKSUM="0x10EBEB" LINKER_VERSION="0x50001" UPTO_BIN_FILE_VERSION="5.1.2600.6532" UPTO_BIN_PRODUCT_VERSION="5.1.2600.6532" LINK_DATE="03/12/2014 10:48:40" UPTO_LINK_DATE="03/12/2014 10:48:40" VER_LANGUAGE="Deutsch (Deutschland) [0x407]" /> 
</EXE> 
</DATABASE> 

是的，我使用的是Windows這一點。由於this issue，無法使用Linux進行此任務。
我應該怎麼做？

Answer 1

那麼，通過使用Expect的更多功能，您可以很容易地完成一些操作。特別是，expect命令可以等待正則表達式匹配並報告哪些子字符串匹配，然後使用string index從字符中挑選字符。

expect -re {Login \[(\d)(\d)(\d)\]:} 
# It's wise to copy these values from expect_out into other variables immediately 
set digitA $expect_out(1,string) 
set digitB $expect_out(2,string) 
set digitC $expect_out(3,string) 

# Is it zero-based or one-based indexing? Assuming the latter... 
set charA [string index $secret [expr {$digitA - 1}]] 
set charB [string index $secret [expr {$digitB - 1}]] 
set charC [string index $secret [expr {$digitC - 1}]] 

我不太清楚你如何組裝這些文字轉化成反應 - 你的描述不夠清楚 - 但我相信你能明白這一點，現在你已經得到了原料。