CODEWITHSUNDEEP
perl
Ωmega
Ωmega

Reputation: 43683

Warning: '\\' will be treated literally inside []

My Perl code contains the following lines:

use Math::Random::Secure qw /irand/;
use String::Random;

$c = String::Random->new(rand_gen => sub {return irand($_[0]);})->randregex('[\da-f]{32}');

And I am experiencing the following warning message:

'\\' will be treated literally inside []

What that means and what I am doing wrong?

Upvotes: 1

Views: 209

Answers (2)

ikegami
ikegami

Reputation: 386416

Another solution is to avoid String::Random entirely. The already-used irand returns 32 bit integers, so you could use the following:

my $c = unpack 'H*', pack 'L*', map irand, 1..4;

As a bonus, I imagine this solution will be faster.

Upvotes: 1

Dave Mitchell
Dave Mitchell

Reputation: 2403

From the docs for String::Random::randregex:

Please note that the arguments to randregex are not real regular expressions. Only a small subset of regular expression syntax is actually supported .... Currently special characters inside [] are not supported.

So perhaps replace \d with 0-9

Upvotes: 1

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