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Home: Perl Programming Help: Beginner: How to validate special character passwords?

Shrutika Novice Oct 3, 2013, 3:25 AM Post #1 of 11 (3196 views) How to validate special character passwords? Can't Post Hi, I am writing a program to check if the password entered is bad,strong or excellent. If a password is excellent, the password needs to include letter in capital(atleast one), atleast one digit and atleast one specail character(@,$ etc.) I am able to validate everything except special characters. Please help.Couldnt find the answer,though its such a simple thing

Tejas User Oct 3, 2013, 3:43 AM Post #2 of 11 (3195 views) Re: [Shrutika] How to validate special character passwords? [In reply to] Can't Post Need to have a preceeding '\' before the character. For example if u are searching for $, then it should be \$. Thanks Tejas

Shrutika Novice Oct 3, 2013, 4:13 AM Post #3 of 11 (3193 views) Re: [Tejas] How to validate special character passwords? [In reply to] Can't Post Thanks Tejas. But isnt there a shorter way? as in like for digits we can use [0-9] or \d. Any such shorthand for special characters?

Tejas User Oct 3, 2013, 4:15 AM Post #4 of 11 (3191 views) Re: [Tejas] How to validate special character passwords? [In reply to] Can't Post Can you please paste the code snippet over here, So that i can analyse and understand the requirement . Just post whatever you have tried

Tejas User Oct 3, 2013, 4:21 AM Post #5 of 11 (3190 views) Re: [Shrutika] How to validate special character passwords? [In reply to] Can't Post Character classes also have ordinary and special characters, but the sets of ordinary and special characters inside a character class are different than those outside a character class. The special characters for a character class are -]\^$ and are matched using an escape: /[\]c]def/; # matches ']def' or 'cdef' $x = 'bcr'; /[$x]at/; # matches 'bat, 'cat', or 'rat' /[\$x]at/; # matches '$at' or 'xat' /[\\$x]at/; # matches '\at', 'bat, 'cat', or 'rat'

Shrutika Novice Oct 3, 2013, 4:25 AM Post #6 of 11 (3188 views) Re: [Tejas] How to validate special character passwords? [In reply to] Can't Post Well here's my basic structure of the code #! /usr/bin/perl print("Enter password\n"); $in=<STDIN>; if($in=~ /(?=.*[A-Z])(?=.*[a-z])(?=.*[\W])/) { print("Excellent password\n"); } elsif($in =~ /(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])/) { print("Good password \n"); } elsif($in =~ /(?=.*[A-Z])(?=.*[a-z])/) { print("Bad password\n"); }

Tejas User Oct 3, 2013, 4:28 AM Post #7 of 11 (3187 views) Re: [Tejas] How to validate special character passwords? [In reply to] Can't Post Perl has several abbreviations for common character classes. (These definitions are those that Perl uses in ASCII-safe mode with the /a modifier. Otherwise they could match many more non-ASCII Unicode characters as well. See Backslash sequences in perlrecharclass for details.) \d is a digit and represents [0-9] \s is a whitespace character and represents [\ \t\r\n\f] \w is a word character (alphanumeric or _) and represents [0-9a-zA-Z_] \D is a negated \d; it represents any character but a digit [^0-9] \S is a negated \s; it represents any non-whitespace character [^\s] \W is a negated \w; it represents any non-word character [^\w] The period '.' matches any character but "\n" Above might help you too.

Shrutika Novice Oct 3, 2013, 4:31 AM Post #8 of 11 (3186 views) Re: [Tejas] How to validate special character passwords? [In reply to] Can't Post Thanks a lot Tejas. I 'll try the code with the inputs you have given

Tejas User Oct 3, 2013, 5:20 AM Post #9 of 11 (3183 views) Re: [Shrutika] How to validate special character passwords? [In reply to] Can't Post Thanks. Please do come with the final piece of code, if successful Thanks

Shrutika Novice Oct 8, 2013, 7:14 AM Post #10 of 11 (3156 views) Re: [Tejas] How to validate special character passwords? [In reply to] Can't Post #! /usr/bin/perl print("Enter password\n"); $in=<STDIN>; if($in=~ /(?=.*[A-Z])(?=.*[a-z])(?=.*[\d])(?=.*[\$\@\!\#\%\^\&\*\(\)])/) { print("Excellent password\n"); } elsif($in =~ /(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])/) { print("Good password \n"); } elsif($in =~ /(?=.*[A-Z])(?=.*[a-z])/) { print("Bad password\n"); } This code works as I want it to. Thanks for the inputs.

Tejas User Oct 8, 2013, 8:05 AM Post #11 of 11 (3150 views) Re: [Shrutika] How to validate special character passwords? [In reply to] Can't Post Ok cool So, U have considered the slash in front of all the special char's u wanted.

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