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  2. Telephone number verification - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_verification

    A JavaScript function can check to see if a phone number is a valid format, i.e., is numeric, starts with a valid set of numbers ("0" for local, or an international dialing prefix followed by a valid country code and is not too short to be a phone number. At first a JavaScript function is used to clear out any spacer characters.

  3. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    Luhn algorithm. The Luhn algorithm or Luhn formula, also known as the " modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in US patent 2950048A, granted on 23 August 1960. [ 1]

  4. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    W3C Markup Validation Service. The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

  5. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    List of file signatures. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.

  6. Ampersand - Wikipedia

    en.wikipedia.org/wiki/Ampersand

    Time period: c. 100 CE to present Descendants • ⅋ Sisters: Greek letter ϗ (ligature of κ, α and ι similarly to &) Armenian letter և (ligature of ե and ւ, pronounced /jɛv/; եւ is the Armenian word for "and");

  7. ECMAScript - Wikipedia

    en.wikipedia.org/wiki/ECMAScript

    Standards. ECMAScript ( / ˈɛkməskrɪpt /; ES) [ 1] is a standard for scripting languages, including JavaScript, JScript, and ActionScript. It is best known as a JavaScript standard intended to ensure the interoperability of web pages across different web browsers. [ 2] It is standardized by Ecma International in the document ECMA-262 .

  8. Email address - Wikipedia

    en.wikipedia.org/wiki/Email_address

    The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.

  9. PHP - Wikipedia

    en.wikipedia.org/wiki/PHP

    As of 23 July 2024 (eight months after PHP 8.3's release), PHP is used as the server-side programming language on 76.1% of websites where the language could be determined; PHP 7 is the most used version of the language with 53% of websites using PHP being on that version, while 32.5% use PHP 8, 14.3% use PHP 5 and 0.2% use PHP 4. [19]