In Perl a very useful function is split, which splits up a string and places it into an array.
For Example,
my $str = "user:group:root:testing";
@user = split(/:/, $string);
Here @user holds the details of the $str.
As in your case you have only two fields delimited by ':', you can directly split and save the values into the variables as below,
my $yourstr = "user:pass";
my ($User,$Pass) = split (/:/,$yourstr);
print "User:$User\n";
print "Pass:$Pass\n";
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