Regular expression for barcodes (12 or 14 digits)

I'm looking for regular expression which will match barcode. The barcodes can be 12 or 14 digits long (never 13) and the first digit has to be 8. Examples:

800909887898  
80903243234323

I've got something like this: ^[8]{1}[0-9]{11}$ but I don't know hot to recognize last 2 di开发者_JAVA技巧gits. It's can be 2 digits character or null (the expression [0-9]{0-2} will not work fine because quantifier don't work like OR).

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Check this one

^8[0-9]{11}([0-9]{2})?$

[0-9]{2} means two digits

(...)? means zero or one time

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So, if you want something that starts with 8 and can be exactly 12 or 14 digits, then you can use | for an "or" in the regex:

^8\d{11}$|^8\d{13}$