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  1. or download this
    use strict;
use warnings;

...
print "Regex2 is $regex2\n";
print "Regex3 is $regex3\n";
print "Regex4 is $regex4\n";
  2. or download this
    String is Hello# World
Regex1 is (?x-ism:Hello\#\ World\\E)
Regex2 is (?x-ism:Hello\#\ World)
Regex3 is (?x-ism:Hello# World
)
Regex4 is (?x-ism:Hello\#\ World)
  3. or download this
    $ perl8 regex.pl
String is Hello# World
...
)
Regex4 is (?x-ism:Hello\#\ World
)
  4. or download this
    $ perl10 regex.pl
String is Hello# World
Regex1 is (?x-ism:Hello\#\ World\\E)
...
Regex3 is (?x-ism:Hello# World
)
Regex4 is (?x-ism:Hello\#\ World)