Regex to detect one of several strings

 

I've got a list of email addresses belonging to several domains. I'd like a regex that will match addresses belonging to three specific domains (for this example: foo, bar, & baz)

So these would match:

  • a@foo
  • a@bar
  • b@baz

    • This would not:

  • a@fnord

    • Ideally, these would not match either (though it's not critical for this particular problem):

  • a@foobar
  • b@foofoo

    • Abstracting the problem a bit: I want to match a string that contains at least one of a given list of substrings.

    Use the pipe symbol to indicate "or": 

    /a@(foo|bar|baz)b/

    If you don't want the capture-group, use the non-capturing grouping symbol: 

    /a@(?:foo|bar|baz)b/

    (Of course I'm assuming " a " is OK for the front of the email address! You should replace that with a suitable regex.) 

    ^(a|b)@(foo|bar|baz)$

    if you have this strongly defined a list. The start and end character will only search for those three strings.

    Use: 

    /@(foo|bar|baz).?$/i

    Note the differences from other answers:

  • .? - matching 0 or 1 dots, in case the domains in the e-mail address are "fully qualified"
  • $ - to indicate that the string must end with this sequence,
  • /i - to make the test case insensitive.

    • Note, this assumes that each e-mail address is on a line on its own.

    If the string being matched could be anywhere in the string, then drop the $ , and replace it with s+ (which matches one or more white space characters)

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