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Every regular expression can be written solely in terms of the Kleene star and set unions over finite words. This is a surprisingly difficult problem. As simple as the regular expressions are, there is no method to systematically rewrite them to some normal form. The lack of axiom in the past led to the star height problem.
Therefore, systems that pad to a specific number of digits (by converting 1234 to 0001234 for instance) can perform Luhn validation before or after the padding and achieve the same result. The algorithm appeared in a United States Patent [ 1 ] for a simple, hand-held, mechanical device for computing the checksum.
Unlike keyword searching, regex searching is by default case-sensitive, does not ignore punctuation, and operates directly on the page source (MediaWiki markup) rather than on the rendered contents of the page. To perform a regex search, use the ordinary search box with the syntax insource:/regex/ or intitle:/regex/.
Regular Expression Flavor Comparison – Detailed comparison of the most popular regular expression flavors; Regexp Syntax Summary; Online Regular Expression Testing – with support for Java, JavaScript, .Net, PHP, Python and Ruby; Implementing Regular Expressions – series of articles by Russ Cox, author of RE2; Regular Expression Engines
Each French person receives at birth a national identification number, the "numéro d'inscription au répertoire" (NIR or National Repertory registration), also called a "numéro de sécurité sociale" (or Social Security number). This INSEE number is composed of 13 digits + a two-digit key.
046 454 286 <--- A fictitious, but valid, SIN. 121 212 121 <--- Multiply every second digit by 2. The result of the multiplication is: 0 8 6 8 5 8 2 16 6 Then, add all of the digits together (note that 16 is summed as the individual digits 1+6): 0 + 8 + 6 + 8 + 5 + 8 + 2 + 1+6 + 6 = 50 If the SIN is valid, this number will be evenly divisible ...
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The origins of the CUSIP system go back to 1964, when the financial markets were dealing with what was known as the securities settlement paper crunch on Wall Street. [5] [6] [7] At that time, increased trading volumes of equity securities, which were settled by the exchange of paper stock certificates, caused a backlog in clearing and settlement activities.