Regex to not match tab, carriage return and square brackets

Question

I need a regex to not match tab, carriage return and square brackets. (C#)

Answer 1

Try:

[^\][\t\r]

• [] - char class
• ^ - negation of char class.
• \] - escape ] as ] is a meta char inside a char class
• [ - need not escape [ as inside [] its not a meta char
• \t - tab
• \r - return carriage

Answer 2

should be:

[^\t\r\[\]]

or for the whole string:

^[^\t\r\[\]]*$

Answer 3

[\w]+

Will match any word character (alphanumeric & underscore).

Answer 4

#!/usr/bin/perl

use strict; use warnings;

my ($s) = @ARGV;

if ( $s =~ /^[^\r\t\[\]]*\z/ ) {
    print "$s contains no carriage returns, tabs or square brackets\n";
}