Regular Expression Issue Pattern not working

Question

I have a regular expression which accepts only an email with the following pattern.

@stanford.edu.uk or word.edu.word

here it is

/(\.edu\.\w\w\w?)$/

It appears that this only works when .edu is followed by ".xx" (example: school.edu.au or college.edu.uk). I need this to also work for e-mails that end with .edu (example: school.edu or student.college.edu)

I tried this:

/(\.w+\.w+\.edu)$/

If any one can help?

Check this answer https://stackoverflow.com/questions/201323/how-to-validate-an-email-address-using-a-regular-expression — Nikola Kirincic, Jun 20 '18 at 06:32
Try [`\.edu(?:\.\w{2,3})?$`](https://regex101.com/r/N81HS4/2) — Wiktor Stribiżew, Jun 20 '18 at 06:32
This is a great website for figuring out if your regex will work. https://regex101.com/ — lukehillonline, Jun 20 '18 at 06:49
Glad it worked for you. Please consider accepting/upvoting [the answer](https://stackoverflow.com/a/50941797/3832970). — Wiktor Stribiżew, Jun 20 '18 at 12:22

score 1 · Accepted Answer · answered Jun 20 '18 at 06:40

Your (\.edu\.\w\w\w?)$ pattern requires a . and at 2 to 3 word chars after it before the end of the string, so it can't match strings with .edu at the end.

You may fix the pattern using

\.edu(?:\.\w{2,3})?$

See the regex demo

Details

\.edu - an .edu substring
(?:\.\w{2,3})? - an optional non-capturing group matching 1 or 0 occurrences of
- \. - a dot
- \w{2,3} - 2 to 3 word chars
$ - end of string.

Note that \w matches letters, digits and _. You might want to precise this bit in case you only want to match letters ([a-zA-Z] to only handle ASCII, or use ECMAScript 2018 powered \p{L} Unicode property class (not working in older browsers), or build your own pattern to support all Unicode letters).

Also, consider going through How to validate an email address using a regular expression?

Regular Expression Issue Pattern not working

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