Validate email with RegEx following rules

Question

Needs to only contain [a-zA-Z0-9.], and followed by an @ then the same match afterward, the match before, and after the @ shouldn't be any longer than 64 characters long, and at least one length.

^([a-zA-Z0-9\-\.]+){1,64}@([a-zA-Z0-9\-\.]){1,64}$

This seems to work but it sometimes takes forever, why is this?

"then the same match afterward" - So "abc@abc" would be valid, but "abc@aaa" would not? (I don't really think that's what you meant, but it's what you said.) Why does the part to the left of the "@" have both a + and {1,64}? That allows any number of characters. Remove the +, and if you just want to test "does it match" you can remove all of the parentheses. — nnnnnn
– nnnnnn, Commented Jun 27, 2017 at 3:42
Sometime it is getting hanged. It is taking long time. If we try same thing again then it works. — Amit Garg
– Amit Garg, Commented Jun 27, 2017 at 3:59

JuanCrg90 · Accepted Answer · 2017-06-27 06:02:29Z

I'm not sure why you have the + operator in the first part of the regex. I hope this could be useful for you

^([a-zA-Z\d\.]{1,64})@([a-zA-Z\d\.]{1,64})$

Dim · Accepted Answer · 2017-06-27 04:07:20Z

For email regex you should use http://emailregex.com/ which provides this regex

/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/

also, if you can you should usually just use

<input type="email">

You've just copied this from another solution, this does not meet my requirements.

Collectives™ on Stack Overflow

Validate email with RegEx following rules

2 Answers 2

Comments

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Related