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Major credit card validator. Only checks that the format is 16 digits (optionally separated by hyphens), not the value of any of the digits.

Credit card validator. Just checks that the format is either 16 numbers in groups of four separated by a "-" or a " " or nothing at all.

Matches major credit cards including: Visa (length 16, prefix 4), Mastercard (length 16, prefix 51-55), Discover (length 16, prefix 6011), American Express (length 15, prefix 34 or 37). All 16 digit formats accept optional hyphens (-) between each group of four digits.

This provides an expression to calidate the four major credit cards. It can be easily broken up to use for a specific type of card. It does not validate the number being a potential real number, only in the correct format.

This just a minor mod to Steven Smith's credit card re to accept spaces as separators, as well as return the four parts of the card. [Updated Oct-18-2002 to work with Diners Club/Carte Blanche (prefix must be 36, 38, or 300-305)]

Validates MM/YY for rough checking credit card expiration dates.

Credit card validator for AMEX, VISA, MasterCard only. Allows spaces, dashes, or no separator between digit groups according to the layout (4-6-5 for AMEX, 4-4-4-4 for Visa and Mastercard)

Credit card validator Works for switch card numbers too Switch card bit is (\d{6}[-\s]?\d{12}) Credit card bit is (\d{4}[-\s]?\d{4}[-\s]?\d{4}[-\s]?\d{4}) I use this as a client side test before running a more comprehensive server side check.

Used to validate Credit Card numbers, Checks if it contains 16 numbers in groups of 4 separated by -, ,or nothing

Updated on 7 Jun 2005 -- Matches major credit cards including: Visa (length 16, prefix 4); Mastercard (length 16, prefix 51-55); Diners Club/Carte Blanche (length 14, prefix 36, 38, or 300-305); Discover (length 16, prefix 6011); American Express (length 15, prefix 34 or 37). Saves the card type as a named group to facilitate further validation against a "card type" checkbox in a program. All 16 digit formats are grouped 4-4-4-4 with an optional hyphen or space between each group of 4 digits. The American Express format is grouped 4-6-5 with an optional hyphen or space between each group of digits. Formatting characters must be consistant, i.e. if two groups are separated by a hyphen, all groups must be separated by a hyphen for a match to occur.

Allows you to check the length of a number (in this case either 3 or 4 digits). I found it useful when validating Credit Card Identification Codes (CVV2/CVC2/CID) which are either 3 or 4 numerical digits.

Credit Card Matching - Matches Switch, Solo, Visa, MasterCard and Discover. Matches length and valid prefix. Accepts input optional spaces and dashes between number groups

Credit Card Validation. Matches Switch/Solo, Visa, MasterCard and Discover in 4-4-4-4/4 4 4 4/4444 format and Amex in 4-6-5/4 6 5/465 format. Includes checks for prefixes, (67 for switch/solo, 4 for visa, 51-55 for MasterCard, 37/34 for Amex and 6011 for Discover. Matches all major UK debit and credit cards with spaces dashes or as a continous number

Matches Names - written for credit card matching. Optional Prefix that can contain a fullstop, one or more forenames that can contain hyphens and apostrophes followed by a surname that can contain hyphens and apostrophes

Validates Mastercard credit card

For credit card numbers from MC, Visa, Amex, Diners/CarteBlanche, Discover/Novus, Enroute, and JCB. Does as much as I feel is possible using regex (doesn't do MOD 10). Javascript safe.

Matches Visa CC types 13 or 16 digits starting with 4 including Visa CC, Visa ATM only, Visa Electron and Visa Delta. Safe for international and will NOT match "^(49)" Switch debit cards.

Meastro ONLY card matching - begins with "50" or "56-58" or "6" & 13 to 20 total digits. Overlap of Discover, Solo and Switch is handled and NOT matched.

Matches MasterCard credit cards. International safe, no overlap with other cards.

Discover Credit Card matching. International safe, no overlap