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Regular Expression Details

Title	Test Find Employer Identification Number (EIN)
Expression	^[1-9]\d?-\d{7}$
Description	Accepts valid EIN numbers. It could use a bit of tweaking because these are the current valid prefixes allowed. 1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 20, 21, 22, 23, 24, 25, 26, 27, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 71, 72, 73, 74, 75, 76, 77, 80, 81, 82, 83, 84, 85, 87, 88, 90, 91, 92, 93, 94, 95, 98, 99
Matches	55-5555555 \| 1-2345678 \| 99-9999999
Non-Matches	00-1111111 \| my-einnumb \| 5-55555
Author	Rating: Brendan Enrick
Source
Your Rating	Bad 1 2 3 4 5 Good

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Existing User Comments

Title: Up to date with the latest prefixes
Name: scull7
Date: 5/8/2018 6:28:07 AM
Comment:
^(0[1-6]||1[0-6]|2[0-7]|[345]\d|[68][0-8]|7[1-7]|9[0-58-9])-?\d{7}$ https://www.irs.gov/businesses/small-businesses-self-employed/how-eins-are-assigned-and-valid-ein-prefixes https://regex101.com/r/ASlLeu/2

Title: to handle all prefixes
Name: fish
Date: 3/22/2017 8:51:59 PM
Comment:
^[0-9]\d?-\d{7}$

Title: wtf do i do with this
Name: confused
Date: 10/27/2016 12:37:11 AM
Comment:
is this js? php? asp? wtf?

Title: To limit to actual prefixes
Name: Christopher
Date: 2/17/2016 9:28:56 PM
Comment:
^(0[1-6]||1[0-6]|2[0-7]|[35]\d|[468][0-8]|7[1-7]|9[0-58-9])-\d{7}$ Note this won't stay up to date if new prefixes are added.

Title: Don't match 00-
Name: Christopher
Date: 2/17/2016 9:13:36 PM
Comment:
Cannot begin with "00-" This is slightly stricter (although it still matches other prefixes that don't exist). ^(0[1-9]|[1-9]\d)-\d{7}$

Title: Doesn't match leading zero
Name: Dean Moriarty
Date: 10/24/2011 1:29:19 PM
Comment:
Doesn't match 03-0235372. I'm using ^\d{2}-\d{7}$ which doesn't check for valid campus. See http://en.wikipedia.org/wiki/Employer_Identification_Number.

Title: Incorrect
Name: chia
Date: 4/4/2011 3:43:47 PM
Comment:
This is actually not correct validation. 020532420 will fail, and this is a valid EIN. ^[0-9]{2}\-?\d{7}$

Title: Incorrect
Name: chia
Date: 4/4/2011 3:43:33 PM
Comment:
This is actually not correct validation. 020532420 will fail, and this is a valid EIN. ^[0-9]{2}\-?\d{7}$

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