Can you have "optional multiple ANY characters"?

Question

I currently have the regex string @"[0-9a-zA-Z].+@.+[0-9a-zA-Z]$" The problem with it is that it requires 2+ characters before and after the "@", so an input like a@a won't be valid, while it should

What I need is a way to do .+? without the "Any character" (?) turning into a lazy quantifier

read https://stackoverflow.com/questions/1365407/c-sharp-code-to-validate-email-address — Casimir et Hippolyte, Oct 27 '19 at 10:39

Jacek Rojek · Accepted Answer · 2019-10-27T10:39:16.403

0

Try changing + to * after each .

[0-9a-zA-Z].*@.*[0-9a-zA-Z]$

https://regex101.com/r/sNMQsw/3

edited Oct 27 '19 at 10:39

answered Oct 27 '19 at 10:33

Jacek Rojek

1,082
8
16

The problem is that it HAS to start with a-z0-9A-Z, can't start with a "{", and your answer would allow for that – Krystian Oct 27 '19 at 10:36
1

Could you provide a test suit of valid/invalid cases? – Jacek Rojek Oct 27 '19 at 10:37
Answer updated with new regex – Jacek Rojek Oct 27 '19 at 10:40
Perfect, didn't know about the * char, thanks! – Krystian Oct 27 '19 at 10:42
If it's an email validation for commercial use consider using existing solutions https://stackoverflow.com/questions/1365407/c-sharp-code-to-validate-email-address – Jacek Rojek Oct 27 '19 at 10:43

Can you have "optional multiple ANY characters"?

1 Answers1