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    Validating isbn

    I need a script that will test an input field's contents to see if it contains an ISBN.

    I found a few examples of this, but none of them strip the dashes.

    ISBN (International Standard Book Numbers) are 10-digit numbers (from 2007: 13-digit numbers) defined in the ISO 2108 standard.

    They are unambigous identifiers for books and other nonperiodic media.

    Custom Active Record Validation for International Standard Book Number (ISBN) fields. Will guarantee that validated fields contain valid ISBNs.

    Default behaviour is to allow either ISBN-10 or ISBN-13, but this can be altered by specifying the :with option as shown in the example below.

    The assignment of ISBNs is coordinated by the International ISBN Agency. Publishers apply to these national/regional agencies for the ISBN that they need.

    This agency assigns certain number ranges to national/regional ISBN agency (such as the UK ISBN Agency (UK and Ireland) and R. The form on this site allows you to check an ISBN for consistency using the built-in checksum.

    = # Basic format pre-checks (lookahead): [0-9]$ # Require 13 digits (no separators).

    You need to check the validity of an International Standard Book Number (ISBN), which can be in either the older ISBN-10 or the current ISBN-13 format.

    You want to allow a leading “ISBN” identifier, and ISBN parts can optionally be separated by hyphens or spaces. :[0-9] [-\ ])) # Require 3 separators [-\ 0-9X]$ # out of 13 characters total.

    All of the following are examples of valid input: You cannot validate an ISBN using a regex alone, because the last digit is computed using a checksum algorithm. = # Basic format pre-checks (lookahead): [0-9X]$ # Require 10 digits/Xs (no separators).

    The regular expressions in this section validate the format of an ISBN, whereas the subsequent code examples include a validity check for the final digit.

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