Parsing of a File and SEARCH ...........HELP!!!!!!!!!!!!!

[Rahul Garg]

Hello Everybody,

   well i am looking for various types of searching...help 
   
1)I want to look out for a particular string in a file.
   Actually there is only one strng in each line of a file.
    How to search for it.............sample code........as i am new to syntax of perl

2)I want to look out for a particular part(match) in a string in a file.
   Actually there is only one string in each line of a file.
   How to search for it.............sample code........

Thanx in advance,
Rahul