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Top Forums UNIX for Dummies Questions & Answers PERL pattern matching in a file Post 302523841 by pvksandeep on Friday 20th of May 2011 03:07:32 AM
Old 05-20-2011
Hi -

Its working fine.

One small clarification in the code.

Forgot to mention earlier.. My string can have spaces in between.. If I give a space in regexp.. its working

my @regexen=(qr'(^[0-9 a-zA-Z]+$)',qr'(^[ 0-9]+$)',qr'(^[MF]$)');

What does $1 represents inside first "if" condition? Does it means first left paranthesis and $2 means second left paranthesis.

If my string is something like "Ravi Go" .. then $1=Ravi and $2=Go .. right? Correct me if my understanding is not correct. If its like that, then $1 will get only first substring. Here in the code it s working fine. But just want to know how it is working.


Also could you tell me if I want to skip matching first column and check for other two column attribute values .. is this correct?

code:

my @regexen=(qr'(^.*$)',qr'(^[0-9]+$)',qr'(^[MF]$)');

Last edited by pvksandeep; 05-20-2011 at 04:32 AM..
 

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CD(1)							    BSD General Commands Manual 						     CD(1)

NAME
cd -- change working directory SYNOPSIS
cd directory DESCRIPTION
Directory is an absolute or relative pathname which becomes the new working directory. The interpretation of a relative pathname by cd depends on the CDPATH environment variable (see below). ENVIRONMENT
The following environment variables affect the execution of cd: CDPATH If the directory operand does not begin with a slash (/) character, and the first component is not dot (.) or dot-dot (..), cd searches for the directory relative to each directory named in the CDPATH variable, in the order listed. The new working directory is set to the first matching directory found. An empty string in place of a directory pathname represents the current directory. If the new working directory was derived from CDPATH, it will be printed to the standard output. HOME If cd is invoked without arguments and the HOME environment variable exists and contains a directory name, that directory becomes the new working directory. See csh(1) for more information on environment variables. The cd utility exits 0 on success, and >0 if an error occurs. SEE ALSO
csh(1), pwd(1), sh(1), chdir(2) STANDARDS
The cd command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. BSD
June 5, 1993 BSD
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