#!/opt/perl/bin/perl
use strict;
use warnings;
use charnames ':full';

binmode STDOUT, ":utf8";
my $string = ':)';

print "$string becomes: ";

$string =~ s/:\)/\N{WHITE SMILING FACE}/;

print "$string\n$string becomes: ";

$string =~ s/\N{WHITE SMILING FACE}/\N{BLACK SMILING FACE}/;

print "$string\n$string becomes: ";

$string =~s/\N{BLACK SMILING FACE}/:\)/;

print "$string\n";
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That should cover most uses of \N{CHARNAME}.

charnames and perlre are the best references.

perlre should have a section on it. It appears that perlre points to charnames. The charnames page appears to have a plethora of examples.

If you would show us some code that you are having problems with, perhaps we could see what is happening.

how I use special character \N{name} in regular expression

Example:

#!/usr//bin/perl -wl
use strict;
use charnames ':full';

my $string = "foo \N{COPYRIGHT SIGN} bar";

print "matched" if $string =~ /\N{COPYRIGHT SIGN}/;
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The list of names can be found in the file .../unicore/NamesList.txt that comes with Perl.

Just like any other character I suspect. If you look into perldoc perlrecharclass, it is mentioned that \N{} are valid in regexes. And when I tested it it worked:

> perl -e '$_="haba\N{U+263A}ugo"; $n= m/(\N{U+263A})/; print $n;'
1
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how i use \e (special character) in perl program

Your question doesn't make sense. Are you asking what \e does in double-quoted string literals? It evaluates to the ESC character (0x1B). See "Quote and Quote-like Operators" in perlop for the documentation for double-quoted string literals.

Please don't change your question, if you have another question to ask then post another node

You can find most of the answerss your looking for in perlre. It's going to get rather boring if you ask for every character one by one