regex to get emailaddress with / without display name

Question

In my case, content will come it may contain emailaddress in any of the below format.

1. From : [email protected] 2. From:[email protected] 3. rom: sdcasdc <[email protected]> 4. From: "adads" <[email protected]> 5. From: <[email protected]>

I need to find the one of the above pattern and extract the email address from this

Regex I tried

From\s*:\s*((["|']?)[\w|\s]+\2)?\s*(\<?)([\w]([\w\-\.\+\'\/]*)@([\w\-\.]*)(\.[a-zA-Z]{2,22}(\.[a-zA-Z]{2}){0,2}))(\>?)

All the format matches in my regex. But except 1 and 2, I'll be extract the email address from the regex using group(4).

But in case of 1 and 2, It does not give me full emailaddress.

Please help to alter the regex so that it matches all my case.

You’ve got so many capturing groups… use (?:…) more often. Use (…) only when needed, e.g. to extract the email itself. It’s getting quite confusing otherwise. — Sebastian Simon
– Sebastian Simon, Commented Feb 20, 2017 at 7:05
From\s*:\s*.*?([^"\n<>]+@[^"\n<>]+\.[^"\n<>]+) appears to work just fine. — Sebastian Simon
– Sebastian Simon, Commented Feb 20, 2017 at 7:10
Possible duplicate of What is the correct regular expression for an email address? — tripleee
– tripleee, Commented Feb 20, 2017 at 7:54
@Xufox "Appears to work" until you add more test cases, yes. This is a common FAQ and the standard answer is "don't do that; or at least understand the problem well enough to understand what compromises you need to make". Not using a regex is usually the sane way forward. — tripleee
– tripleee, Commented Feb 20, 2017 at 7:55

Sebastian Simon · Accepted Answer · 2017-02-20 07:51:33Z

Your regex expects an unquoted name before the actual email address. It’s already matching some letters without knowing whether they belong to the email address or to the unquoted name.

I think your regex may be a bit too complex; it can be simplified. This regex appears to work just fine for those cases:

/From\s*:\s*.*?([^"'<>\s]+@[^"<>\s]+\.[^"'<>\s]+)/gi

RegEx101 Demo.

The first capturing group gives you the email address.

It tries to match characters before and after an @ symbol that don’t include spaces or other delimiters. After the @ a TLD has to appear.

This can’t filter out all invalid emails or match all valid emails, but it’s good enough for most cases.

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