CODEWITHSUNDEEP
regexemailexpression
nogalo
nogalo

Reputation: 66

Regex for email, between 10 and 30 characters

I have to make regex expression for e-mail. It is allowed to have letters or numbers only before the @ symbol, optionally only the dot that can not be on the start. After @ symbol it is allowed to have letters or numbers only, exactly one dot and after dot at least 2 characters.

That's my expression

/([a-zA-Z\d*])+(\.?)([a-zA-Z\d*])*@{1}([a-zA-z\d*])+(\.){1}([a-zA-Z\d*]){2,}/

Whole email should have between 10 and 30 characters, and I don't know how to do that.

Thanks

Upvotes: 1

Views: 1179

Answers (3)

Mohammed Elhag
Mohammed Elhag

Reputation: 4302

^(?=^.{10,30}$)(?=^[A-Za-z0-9])[A-Za-z0-9\.]+@[A-Za-z0-9]+\.[A-Za-z]{2,}$

https://regex101.com/r/cBACF2/10

Should be between 10 to 30 (?=^.{10,30}$) Start with letters & numbers (?=^[A-Za-z0-9]) contains letters & numbers and dot [A-Za-z0-9\.] at least two letter after after last dot [A-Za-z]{2,}

Upvotes: 0

wp78de
wp78de

Reputation: 18950

Actually, you can prefix your pattern with a look-ahead and a quantifier to match between 10 and 30 characters: (?=^.{10,30}$)

Then, your pattern looks like this:

(?=^.{10,30}$)([a-zA-Z\d*])+(\.?)([a-zA-Z\d*])*@{1}([a-zA-z\d*])+(\.){1}([a-zA-Z\d*]){2,}

Demo

Upvotes: 1

JDługosz
JDługosz

Reputation: 5642

The syntax for a range of allowed repeats is {n,m}. You wrote {1} meaning "exactly one" which is pointless. {10,30} is the range you are looking for.

Also, know the escape code for "letters". \w is a "word character", which is the same as [a-zA-Z0-9_]. And why is there a '*' in the character range?

So the problem is that you have pieces which can end up being of various lengths, and need to check the total when done, right?

In Perl you can include code as a assertion. So include (?{ length($&) <= 30 }) as the final assertion.

Upvotes: 0

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