If you want to use snoop or tcpdump with advanced search in the packet, then you would need to convert the string to hex string. For this, either you can use a web search and find some web application to do that or you can use a simple C program like this 🙂
/*
* =====================================================================================
*
* Filename: ascii.c
*
* Description: ascii to dec
*
* Version: 1.0
* Ceated: 03/02/2012 12:08:49 PM
* Revision: none
* Compiler: gcc
*
* Author: Amit Agarwal (aka), amit.
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