I have tried to find a solution to my problem here and here but without luck.
I have written these 2 RegExes for email validation which pretty meet almost all of my criteria
RegEx 1
^\w?[A-Za-z]{1}\w?@[a-z] .[a-z]{2,}(.[a-z]{2,}){0,1}$
RegEx 2
[\w.-] @[a-z] .[a-z]{2,}(.[a-z]{2,}){0,1}$
But they do not solve 1 critical issue.
I want the RegEx to fail when matched with something like:
[email protected]
_@gmail.com
8@gmail.com
[email protected]
[email protected]
8@gmail.com
So basically I want the email to have at least 1 lower or upper case letter and it does not matter it is at the beginning , middle or end of the email itself(before the @).
Could you please help me with this?
CodePudding user response：
/^[^@] [a-zA-Z]@[^@] $/
This regular expression uses the following elements:
^: This matches the start of the string.
[^@] : This matches one or more characters that are not the @ symbol.
[a-zA-Z]: This matches any single letter.
@: This matches the @ symbol.
[^@] : This matches one or more characters that are not the @ symbol.
$: This matches the end of the string.
strings would all be matched by this regular expression:
strings would not be matched:
@example.com
!#$%&* -/=?^_{|}[email protected]`
CodePudding user response：
You could try:
/^[^@] [a-zA-Z]@[^@] $/
CodePudding user response：
You could use positive look ahead to do this.
(?=.*[a-z]) for lowercase
(?=.*[A-Z]) for uppercase
So something like this should do the trick:
(?=.*[a-z])(?=.*[A-Z])[^@ \t\r\n] @[^@ \t\r\n] \.[^@ \t\r\n]
I let you customize the filter after the @ as you seem to have specific needs.