Regex to fail email domain with two consecutive dots -


i trying validate domain part of email , want check there not 2 consecutive dots in domain i.e. following not valid

  • joe@ms..com
  • joe@ms.com..uk
  • joe@..ms.com
  • joe@ms.com.au..

i have regex find 

@+\.{2}|@.+\.{2}

but using regex attribute in .net , want build regex valid (i.e. 1 dots) not 1 fails

i thought ^ character meant

everything not expression

so thought ^(@+\.{2}|@.+\.{2}) have worked not nor .net framework emailaddress attribute - stops joe@ms..com not stop joe@ms.com..au

you can use negative lookahead in front of regex:

@(?!.*?\.\.)[^@]+$

which fail match if 2 consecutive dots present in domain anywhere.

[^@] match 1 or more characters not @

regex demo


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