The bracket metacharacters and negation

    
while(<DATA>){
    print if / [^123]0/
}
__DATA__
    101
    201
    301
    401
    501
    601

1.	Character Class: Alternative Characters
2.	Character Class: Anchored Characters
3.	Character Class: Miscellaneous Characters
4.	Character Class: Remembered Characters
5.	Character Class: Repeated Characters
6.	Character Class: Whitespace Characters
7.	Match any number of alphanumerics followed by a single space character
8.	Match at least one alphanumeric followed by a single space character
9.	Posix and Unicode Classes
10.	The bracketed character class

The bracket metacharacters and negation : Character Class « Regular Expression « Perl