Regex empty string or email

Question

I found a lot of Regex email validation in SO but I did not find any that will accept an empty string   Is this possible through Regex only  Accepting either empty string or email only   I want to have this on Regex only

User · Answer

Don t match an email with a regex   It s extremely ugly and long and complicated and your regex parser probably can t handle it anyway   Try to find a library routine for matching them   If you only want to solve the practical problem of matching an email address  that is  if you want wrong code that happens to  usually  work   use the regular-expressions info link someone else submitted   As for the empty string     is mentioned by multiple people and will work fine

User · Answer

I prefer    s      gi to match empty and empty spaces    x000D   x000D  console log      match    s      gi    x000D  console log    match    s      gi    x000D   x000D   x000D

User · Answer

This regex pattern will match an empty string        And this will match  crudely  an email or an empty string

User · Answer

If you are using it within rails - activerecord validation you can set  allow blank  true  As   validates  email  allow blank  true  format    with  EMAIL REGEX

User · Answer

The answers above work    for empty   but I just tried this and it also works to just leave empty like so     A INTENSE EMAIL REGEX   z i   Same thing in reverse order    A  INTENSE EMAIL REGEX  z i

User · Answer

matching empty string or email        a-zA-Z0-9    -    a-zA-Z0-9 -        a-zA-Z  2  com org net edu gov mil biz info mobi name aero asia jobs museum      matching empty string or email but also matching any amount of whitespace     s     a-zA-Z0-9    -    a-zA-Z0-9 -        a-zA-Z  2  com org net edu gov mil biz info mobi name aero asia jobs museum      see more about the email matching regex itself   http   www regular-expressions info email html

User · Answer

this will solve  it will accept empty string or exact an email id          w   -       w -         w  2 3

[regex] Regex empty string or email

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