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String::Random(3pm) User Contributed Perl Documentation String::Random(3pm)
NAME
String::Random - Perl module to generate random strings based on a pattern
VERSION
version 0.32
SYNOPSIS
use String::Random;
my $string_gen = String::Random->new;
print $string_gen->randregex('\d\d\d'); # Prints 3 random digits
# Prints 3 random printable characters
print $string_gen->randpattern("...");
or
use String::Random qw(random_regex random_string);
print random_regex('\d\d\d'); # Also prints 3 random digits
print random_string("..."); # Also prints 3 random printable characters
DESCRIPTION
This module makes it trivial to generate random strings.
As an example, let's say you are writing a script that needs to generate a random password
for a user. The relevant code might look something like this:
use String::Random;
my $pass = String::Random->new;
print "Your password is ", $pass->randpattern("CCcc!ccn"), "\n";
This would output something like this:
Your password is UDwp$tj5
NOTE!!!: currently, "String::Random" defaults to Perl's built-in predictable random number
generator so the passwords generated by it are insecure. See the "rand_gen" option to
"String::Random" constructor to specify a more secure random number generator. There is
no equivalent to this in the procedural interface, you must use the object-oriented
interface to get this functionality.
If you are more comfortable dealing with regular expressions, the following code would
have a similar result:
use String::Random;
my $pass = String::Random->new;
print "Your password is ",
$pass->randregex('[A-Z]{2}[a-z]{2}.[a-z]{2}\d'), "\n";
Patterns
The pre-defined patterns (for use with "randpattern()" and "random_pattern()") are as
follows:
c Any Latin lowercase character [a-z]
C Any Latin uppercase character [A-Z]
n Any digit [0-9]
! A punctuation character [~`!@$%^&*()-_+={}[]|\:;"'.<>?/#,]
. Any of the above
s A "salt" character [A-Za-z0-9./]
b Any binary data
These can be modified, but if you need a different pattern it is better to create another
pattern, possibly using one of the pre-defined as a base. For example, if you wanted a
pattern "A" that contained all upper and lower case letters ("[A-Za-z]"), the following
would work:
my $gen = String::Random->new;
$gen->{'A'} = [ 'A'..'Z', 'a'..'z' ];
or
my $gen = String::Random->new;
$gen->{'A'} = [ @{$gen->{'C'}}, @{$gen->{'c'}} ];
or
my $gen = String::Random->new;
$gen->set_pattern(A => [ 'A'..'Z', 'a'..'z' ]);
The random_string function, described below, has an alternative interface for adding
patterns.
Methods
new
new max => number
new rand_gen => sub
Create a new String::Random object.
Optionally a parameter "max" can be included to specify the maximum number of
characters to return for "*" and other regular expression patterns that do not
return a fixed number of characters.
Optionally a parameter "rand_gen" can be included to specify a subroutine coderef
for generating the random numbers used in this module. The coderef must accept one
argument "max" and return an integer between 0 and "max - 1". The default
rand_gen coderef is
sub {
my ($max) = @_;
return int rand $max;
}
randpattern LIST
The randpattern method returns a random string based on the concatenation of all
the pattern strings in the list.
It will return a list of random strings corresponding to the pattern strings when
used in list context.
randregex LIST
The randregex method returns a random string that will match the regular
expression passed in the list argument.
Please note that the arguments to randregex are not real regular expressions.
Only a small subset of regular expression syntax is actually supported. So far,
the following regular expression elements are supported:
\w Alphanumeric + "_".
\d Digits.
\W Printable characters other than those in \w.
\D Printable characters other than those in \d.
. Printable characters.
[] Character classes.
{} Repetition.
* Same as {0,}.
? Same as {0,1}.
+ Same as {1,}.
Regular expression support is still somewhat incomplete. Currently special
characters inside [] are not supported (with the exception of "-" to denote ranges
of characters). The parser doesn't care for spaces in the "regular expression"
either.
get_pattern STRING
Return a pattern given a name.
my $gen = String::Random->new;
$gen->get_pattern('C');
(Added in version 0.32.)
set_pattern STRING ARRAYREF
Add or redefine a pattern given a name and a character set.
my $gen = String::Random->new;
$gen->set_pattern(A => [ 'A'..'Z', 'a'..'z' ]);
(Added in version 0.32.)
from_pattern
IGNORE! - for compatibility with an old version. DO NOT USE!
Functions
random_string PATTERN,LIST
random_string PATTERN
When called with a single scalar argument, random_string returns a random string
using that scalar as a pattern. Optionally, references to lists containing other
patterns can be passed to the function. Those lists will be used for 0 through 9
in the pattern (meaning the maximum number of lists that can be passed is 10).
For example, the following code:
print random_string("0101",
["a", "b", "c"],
["d", "e", "f"]), "\n";
would print something like this:
cebd
random_regex REGEX_IN_STRING
Prints a string for the regular expression given as the string. See the synposis
for example.
BUGS
This is Bug FreeX code. (At least until somebody finds oneX)
Please report bugs here:
<https://rt.cpan.org/Public/Dist/Display.html?Name=String-Random> .
AUTHOR
Original Author: Steven Pritchard "steve AT silug.org"
Now maintained by: Shlomi Fish ( <http://www.shlomifish.org/> ).
LICENSE
This program is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
SEE ALSO
perl(1).
SUPPORT
Websites
The following websites have more information about this module, and may be of help to you.
As always, in addition to those websites please use your favorite search engine to
discover more resources.
o MetaCPAN
A modern, open-source CPAN search engine, useful to view POD in HTML format.
<https://metacpan.org/release/String-Random>
o RT: CPAN's Bug Tracker
The RT ( Request Tracker ) website is the default bug/issue tracking system for CPAN.
<https://rt.cpan.org/Public/Dist/Display.html?Name=String-Random>
o CPANTS
The CPANTS is a website that analyzes the Kwalitee ( code metrics ) of a distribution.
<http://cpants.cpanauthors.org/dist/String-Random>
o CPAN Testers
The CPAN Testers is a network of smoke testers who run automated tests on uploaded
CPAN distributions.
<http://www.cpantesters.org/distro/S/String-Random>
o CPAN Testers Matrix
The CPAN Testers Matrix is a website that provides a visual overview of the test
results for a distribution on various Perls/platforms.
<http://matrix.cpantesters.org/?dist=String-Random>
o CPAN Testers Dependencies
The CPAN Testers Dependencies is a website that shows a chart of the test results of
all dependencies for a distribution.
<http://deps.cpantesters.org/?module=String::Random>
Bugs / Feature Requests
Please report any bugs or feature requests by email to "bug-string-random at rt.cpan.org",
or through the web interface at
<https://rt.cpan.org/Public/Bug/Report.html?Queue=String-Random>. You will be
automatically notified of any progress on the request by the system.
Source Code
The code is open to the world, and available for you to hack on. Please feel free to
browse it and play with it, or whatever. If you want to contribute patches, please send me
a diff or prod me to pull from your repository :)
<https://github.com/shlomif/string-random>
git clone http://github.com/shlomif/String-Random
AUTHOR
Shlomi Fish <shlomif AT cpan.org>
BUGS
Please report any bugs or feature requests on the bugtracker website
<https://github.com/shlomif/string-random/issues>
When submitting a bug or request, please include a test-file or a patch to an existing
test-file that illustrates the bug or desired feature.
COPYRIGHT AND LICENSE
This software is copyright (c) 2021 by Shlomi Fish.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
perl v5.32.1 2021-09-17 String::Random(3pm)
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