I have to validation emails from a company. The regex should validate if it come from the company and could come from John.
My regex looks like this now:
/[a-z0-9.]*(john)[a-z0-9.]*@mycompany\.com/
The only problem, it's allows dots in wrong place. I see valid this emails:
john@mycompany.com
smith.john@mycompany.com
john.smith@mycompany.com
But i shouldn't see valid these:
john.@mycompany.com
.john@mycompany.com
/^([a-z0-9][a-z0-9.]*)?(john)([a-z0-9.]*[a-z0-9])?@mycompany\.com$/
This should make sure that characters before/after (john) don't start/end with a . respectively.
Alternative solution
^(?!\.)[a-z0-9.]*(john)(?:[a-z0-9]|\.(?!@))*@mycompany\.com$
Please try
\w+(john)?\.?\w+?@mycompany\.com
This matches
john@mycompany.com
smith.john@mycompany.com
john.smith@mycompany.com
But not
john.@mycompany.com
.john@mycompany.com
In the last case it actually grabs only the part after the dot
john@mycompany.com
when I wrote my answer you already got many answers. :-) Ok, here is other what you can test.
^([[:alnum:]]+\.)?john(\.[[:alnum:]]+)?@mycompany\.com
I tested on regex101.com
If I understood well before and after john should be some word delimited by dot .
