How to check if a string contains a email? [duplicate]

Question

I have this code that checks if an email is valid:

$email = "[email protected]"; $regex = '/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/'; if (preg_match($regex, $email)) { echo $email . " is a valid email. We can accept it."; } else { echo $email . " is an invalid email. Please try again."; }

assuming that I have the following string below:

<html> <body> <p>[email protected]</p> </body> </html>

How could I check if that string has an email or not? (since it does not work with the above code)

like chris85 said; doing like this: regex101.com/r/jC1tU9/1

larv
– larv

2016-08-05 21:54:59 +00:00
Commented Aug 5, 2016 at 21:54 — larv
– larv, Commented Aug 5, 2016 at 21:54

chris85 · Accepted Answer · 2016-08-05 21:52:45Z

The ^ and $ are anchors, requiring the full string match. If you take that off it will match an email somewhere in the string.

Regex Demo: https://regex101.com/r/xI0bC2/1

PHP Usage (with updated to store found email):

<?php $email = "<html> <body> <p>[email protected]</p> </body> </html>"; $regex = '/[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})/'; if (preg_match($regex, $email, $email_is)) { echo $email_is[0] . " is a valid email. We can accept it."; } else { echo $email . " is an invalid email. Please try again."; }

PHP Demo: https://eval.in/618679

@gumuruh this variable is where the matches are put, you can see the full match is put into $email_is[0]

Casimir et Hippolyte · Accepted Answer · 2016-08-05 21:58:59Z

There isn't real solution to this problem, since you will easily obtain false positive.

First thing, your pattern is too naive and doesn't match many email addresses that are correct. However a pattern that matches all email addresses doesn't really exist (or is too complicated and inefficient).

A compromise is to select all text nodes that contains a @ using XPath. Then you split each text node on white-spaces and you test each part with the build-in email validation PHP function: filter_var ($part, FILTER_VALIDATE_EMAIL)

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