Regex to detect one of several strings

Question

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

Answer 1

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)