String with at least one uppercase, one lowercase, one special char, one digit and one white space [duplicate]

Question

I want a script to select a username. The rules for selecting a username are:

• The minimum length of the username must be 5 characters and the maximum may be 10.
• It should contain at least one letter from A-Z
• It should contain at least one digit from 0-9
• It should contain at least one character from amongst @#*=
• It should not contain any spaces.

I have tried this:

if (( length $passwd[$i]<=10 && length $passwd[$i]>=5 && $passwd[$i] =~ /.*\p{Lu}/ && $passwd[$i] =~ tr/0-9//cd  && $passwd[$i] =~ /[a-z]/ ))
{   
    print "PASS\n";
}
else
{
    print "FAIL\n";
}

Answer 1

As one perl regular expression, that could be:

if ($username =~ qr{^(?=.*[A-Z])(?=.*\d)(?=.*[@#*=])(?!.* ).{5,10}$}s) ...

Or:

if ($username =~ qr{^(?=.*[A-Z])(?=.*\d)(?=.*[@#*=])[^ ]{5,10}$}s)