Thank you for your reply! For the first time my search succeeded! But if I try to replace it with my LaTeX-code, it is not working anymore! And this is the crucial question: I need to replace every emoticon with a small icon!

But the search is succeeding in a "buggy" way ... Only two attempts worked:

while(<>) {
foreach (/\N{FACE THROWING A KISS}/g) {print "hurray! And here is your
+ emoticon!\n"};
}
[download]

And putting the emoticon directly in. Here once again my Perl-Filter:

#!/usr/bin/perl

use strict;
use warnings;
use utf8; 
use charnames ':full';
use open qw( :encoding(utf-8) :std );

# while(<>) { # Not working
#   s!\N{FACE THROWING A KISS}!\\includegraphics[height=15pt]{/Users/m
+step/Documents/private_txt/anette/pix/emo01.png}!g;
# }

# while(<>) { # Not working
#   s!&#128536;!\\includegraphics[height=15pt]{/Users/mstep/Documents/
+private_txt/anette/pix/emo01.png}!g;
# }

# while(<>) {
# foreach (/\x{0020}/g) {print "hurray!\n"}; # this is working! (Searc
+hes for a space!)
# }

# while(<>) {
# foreach (/\N{FACE THROWING A KISS}/g) {print "hurray! And here is yo
+ur emoticon!\n"}; # this is working!!!
# }

# while(<>) {
# foreach (/&#128536;/g) {print "hurray! And here is your emoticon!\n"
+}; # this is working!!!
# }

# while(<>) {
# foreach (/\x{D83D}\x{DE18}/g) {print "hurray! And here is your emoti
+con!\n"}; # this is not working!
# }

# while(<>) {
# foreach (/\x{3DD8}\x{18DE}/g) {print "hurray! And here is your emoti
+con!\n"}; # this is not working!
# }

# while(<>) {
# foreach (/\N{U+D83DDE18}/g) {print "hurray! And here is your emotico
+n!\n"}; # this is not working!
# }

# while(<>) {
# foreach (/\N{U+D83D}\N{U+DE18}/g) {print "hurray! And here is your e
+moticon!\n"}; # this is not working!
# }
[download]

echo "😘 🚕" | perl -CSD -nE 'printf "%x\n", ord $1 while m{(.)}g'

suggests that the hex code for the face is 1f618 and for the taxi is 1f695

(-CSD is the command-line equivalent of use open...)

But if I try to replace it with my LaTeX-code, it is not working anymore!

Post your code then...

echo "😘 🚕" | perl -CSD -pE 's/\x{1f618}/some_latex_code/'

output:

some_latex_code 🚕

Wow! That's really impressing, what you do with your shell. Suppose I have to read perlrun to learn all this stuff!
Finally I understood, for what I have to search: \x{1f618} !!! But why my replacement is not working?
I am stumbled! marek

while(<>) {
# foreach (/\x{1f618}/g) {print "hurray! And here is your emoticon!\n"
+}; # this is working!!!
# foreach (/\x{1f695}/g) {print "hurray! And here is your emoticon!\n"
+}; # this is working!!! This is for the taxi
    s/\x{1f618}/latex_code/g;
}
[download]