It's difficult to understand what you're looking for. Three guesses:

#!/usr/bin/perl
use strict;
use warnings;

my @wordlist = ( 
    'He_is_super_hero_Spiderman', 
    'He_was_a_super_actor_Tom', 
    'This_line_is_not_supposed_to_match',
);

# Showing the original list
print "Original list:\n";
foreach my $word_element (@wordlist) {
    print "$word_element\n";
}
print "\n";

# Returning whole line of any containing matching text
print "Finding whole lines containing matches:\n";
foreach my $word_element (@wordlist) {
    if ($word_element =~ /Spiderman|Tom/) {
        print "$word_element\n";
    }
}
print "\n";

# Using $1 to extract the found text
print "Finding and extracting matches:\n";
foreach my $word_element (@wordlist) {
    if ($word_element =~ /(Spiderman|Tom)/) {
        print "$1\n";
    }
}
print "\n";

# Using split to break up the words
print "Not actually looking for matches, just extracting the last word
+:\n";
foreach my $word_element (@wordlist) {
    my @wordlettes = split /\_/, $word_element;
    print "$wordlettes[-1]\n";
}
print "\n";

exit;
[download]

Results:

Original list:
He_is_super_hero_Spiderman
He_was_a_super_actor_Tom
This_line_is_not_supposed_to_match

Finding whole lines containing matches:
He_is_super_hero_Spiderman
He_was_a_super_actor_Tom

Finding and extracting matches:
Spiderman
Tom

Not actually looking for matches, just extracting the last word:
Spiderman
Tom
match
[download]