Check whether a string contains a substring

To find out if a string contains substring you can use the index function:

if (index($str, $substr) != -1) {
    print "$str contains $substr\n";
} 

It will return the position of the first occurrence of $substr in $str, or -1 if the substring is not found.

Another possibility is to use regular expressions which is what Perl is famous for:

if ($mystring =~ /s1\.domain\.example/) {
   print qq("$mystring" contains "s1.domain.example"\n);
}

The backslashes are needed because a . can match any character. You can get around this by using the \Q and \E operators.

my $substring = "s1.domain.example";
    if ($mystring =~ /\Q$substring\E/) {
   print qq("$mystring" contains "$substring"\n);
}

Or, you can do as eugene y stated and use the index function. Just a word of warning: Index returns a -1 when it can't find a match instead of an undef or 0.

Thus, this is an error:

my $substring = "s1.domain.example";
if (not index($mystring, $substr)) {
    print qq("$mystring" doesn't contains "$substring"\n";
}

This will be wrong if s1.domain.example is at the beginning of your string. I've personally been burned on this more than once.