ISO/IEC 7813 is an international standard codified by the International Organization for Standardization and International Electrotechnical Commission that defines properties of financial transaction cards, such as ATM or credit cards. 
The standard defines:
physical characteristics, such as size, shape, location of magnetic stripe, etc. magnetic track data structures
ISO/IEC 7813 specifies the following physical characteristics of the card, mostly by reference to other standards:
Embossed characters by reference to ISO/IEC 7811 Embossing of expiration date the format (MM/YY or MM-YY) Magnetic stripe by reference to ISO/IEC 7811 Integrated circuit with contacts by reference to ISO/IEC 7816-1 Integrated circuit without contacts by reference to ISO/IEC 10536-1, ISO/IEC 14443-1, and ISO/IEC 15693-1
The Track 1 structure is specified as:
STX : Start sentinel "%" FC : Format code "B" (The format described here. Format "A" is reserved for proprietary use.) PAN : Primary Account Number, up to 19 digits FS : Separator "^" NM : Name, 2 to 26 characters (including separators, where appropriate, between surname, first name etc.) FS : Separator "^" ED : Expiration data, 4 digits or "^" SC : Service code, 3 digits or "^" DD : Discretionary data, balance of characters ETX : End sentinel "?" LRC : Longitudinal redundancy check, calculated according to ISO/IEC 7811-2
The maximum record length is 79 alphanumeric characters.
%B4815881002861896^YATES/EUGENE JOHN ^37829821000123456789?
%B4815881002861896^YATES/EUGENE L ^^^0000000 00998000000?
The Track 2 structure is specified as:
STX : Start sentinel ";" PAN : Primary Account Number, up to 19 digits, as defined in ISO/IEC 7812-1 FS : Separator "=" ED : Expiration date, YYMM or "=" if not present SC : Service code, 3 digits or "=" if not present DD : Discretionary data, balance of available digits ETX : End sentinel "?" LRC : Longitudinal redundancy check, calculated according to ISO/IEC 7811-2
The maximum record length is 40 numeric digits (e.g., 5095700000000).
Track 3 is virtually unused by the major worldwide networks and often isn't even physically present on the card by virtue of a narrower magnetic stripe.
A notable exception to this is Germany, where Track 3 content was used nationally as the primary source of authorization and clearing information for debit card processing prior to the adoption of the "SECCOS" ICC standards. Track 3 is standardized nationally to contain both the cardholder's bank account number and branch sort code (BLZ).
Parsing Track 1 and Track 2 can be done with
Regular Expressions. Included here is just the Regular Expression for parsing Track 1.
Regex will capture all of the important fields into the following groups: Group 1: Primary account number (PAN) Group 2: Name Group 3: Expiration Date Group 4: Service Code Group 5: Discretionary data