I just repeat myself. But i invested much effort into "Data::Type" (wa
+s Data::Verify) which actually does all what you are talking about. I
+t encapsulates many CPAN "value type" checking modules already.

   Business::ISSN 0.90 by ISSN
   Locale::SubCountry  by LOCALE::COUNTRYCODE, LOCALE::COUNTRYNAME, LO
+CALE::REGIONCODE, LOCALE::REGIONNAME
   Net::IPv6Addr 0.2 by IP
   Locale::Language 2.02 by LOCALE::LANGCODE, LOCALE::LANGNAME
   Business::CINS 1.13 by CINS
   Email::Valid 0.14 by EMAIL
   Date::Parse 2.23 by DATE
   Business::CreditCard 0.27 by CREDITCARD
   Regexp::Common 2.104 by INT, IP, QUOTED, REAL, URI
   Business::UPC 0.02 by UPC

An update will hit CPAN/SF.net soon.

From the pod:

Data::Type x.x.x supports 44 types:

  BINARY                   - binary code
  BOOL                     - a true or false value
  CINS            0.1.3    - a CUSIP International Numbering System Nu
+mber
  BIO::CODON      0.1.3    - a DNA (default) or RNA nucleoside triphos
+phates triplet
  LOCALE::COUNTRYCODE 0.1.5    - country code
  LOCALE::COUNTRYNAME 0.1.5    - country name
  CREDITCARD               - is one of a set of creditcard type (DINER
+S, BANKCARD, VISA, ..
  DATE            0.1.1    - a date (mysql or Date::Parse conform)
  DATETIME                 - a date and time combination
  DEFINED         0.1.4    - a defined (not undef) value
  DK::YESNO                - a simple answer (ja, nein)
  BIO::DNA        0.1.3    - a dna sequence
  DOMAIN          0.1.4    - a network domain name
  EMAIL                    - an email address
  ENUM                     - a member of an enumeration
  GENDER                   - a gender male, female
  HEX                      - hexadecimal code
  INT                      - an integer
  IP              0.1.4    - an IP (V4, V6, MAC) network address
  ISSN            0.1.3    - an International Standard Serial Number
  LOCALE::LANGCODE 0.1.3    - a Locale::Language language code
  LOCALE::LANGNAME 0.1.3    - a language name
  LONGTEXT                 - text with a max length of 4294967295 (2^3
+2 - 1) characters (..
  MEDIUMTEXT               - text with a max length of 16777215 (2^24 
+- 1) characters (al..
  NUM                      - a number
  OS::PATH        0.1.6    - a path string (not really functional)
  PORT            0.1.4    - a network port number
  QUOTED                   - a quoted string
  REAL                     - a real
  REF                      - a reference to a variable
  LOCALE::REGIONCODE 0.1.5    - region code
  LOCALE::REGIONNAME 0.1.5    - region name
  BIO::RNA        0.1.3    - a rna sequence
  SET                      - a set (can have a maximum of 64 members (
+mysql))
  TEXT                     - blob with a max length of 65535 (2^16 - 1
+) characters (alias..
  TIME                     - a time (mysql)
  TIMESTAMP                - a timestamp (mysql)
  TINYTEXT                 - text with a max length of 255 (2^8 - 1) c
+haracters (alias my..
  UPC             0.1.3    - standard (type-A) Universal Product Code
  URI                      - an http uri
  VARCHAR                  - a string with limited length of choice (d
+efault 60)
  WORD                     - a word (without spaces)
  YEAR                     - a year in 2- or 4-digit format
  YESNO                    - a simple answer (yes, no)

And 4 filters:

  chomp              - chomps
  lc                 - lower cases
  strip              - strip
  uc                 - upper cases

TYPES BY GROUP

 Locale
  LOCALE::COUNTRYCODE, LOCALE::COUNTRYNAME, LOCALE::LANGCODE, LOCALE::
+LANGNAME, LOCALE::REGIONCODE, LOCALE::REGIONNAME

 Logic
  BIO::CODON, BIO::DNA, BIO::RNA, DEFINED, DOMAIN, EMAIL, IP, OS::PATH
+, PORT, REF, URI

 Database
   Logic
      ENUM, SET

   Time or Date related
      DATE, DATETIME, TIME, TIMESTAMP, YEAR

   String
      LONGTEXT, MEDIUMTEXT, TEXT, TINYTEXT

 Business
  CINS, CREDITCARD, ISSN, UPC

 W3C
   String
      BINARY, HEX

 Numeric
  BOOL, INT, NUM, REAL

 String
  DK::YESNO, GENDER, QUOTED, VARCHAR, WORD, YESNO


GROUP "Database"
These are types identical to mysql database builtin types.

CREDITCARD

This type isn't tested at all and nobody should rely on it without rig
+orous testing.

Supported are: 'Diners Club', 'Australian BankCard', 'VISA', 'Discover
+/Novus', 'JCB', 'MasterCard', 'Carte Blache', 'American Express'.
They are parameterised as: DINERS, BANKCARD, VISA, DISCOVER, JCB, MAST
+ERCARD, BLACHE, AMEX.

CONTRIBUTIONS

The author is happy to receive more types (formats) and add to this li
+brary. If you
have a algorithm/regex for validating it, the better. Just email me.

PREREQUISITES
   Class::Maker (0.05.10),
   Error (0.15),
   IO::Extended (0.05),
   Tie::ListKeyedHash (0.41),
   Iter (0)

  and for types
   Business::ISSN 0.90 by ISSN
   Locale::SubCountry  by LOCALE::COUNTRYCODE, LOCALE::COUNTRYNAME, LO
+CALE::REGIONCODE, LOCALE::REGIONNAME
   Net::IPv6Addr 0.2 by IP
   Locale::Language 2.02 by LOCALE::LANGCODE, LOCALE::LANGNAME
   Business::CINS 1.13 by CINS
   Email::Valid 0.14 by EMAIL
   Date::Parse 2.23 by DATE
   Business::CreditCard 0.27 by CREDITCARD
   Regexp::Common 2.104 by INT, IP, QUOTED, REAL, URI
   Business::UPC 0.02 by UPC
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