在 PHP 中，如何从文本块中提取多个电子邮件地址并将它们放入数组中？
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In PHP, how do I extract multiple e-mail addresses from a block of text and put them into an array?
提问by HumbleHelper
I have a block of text from which I want to extract the valid e-mail addresses and put them into an array. So far I have...
我有一个文本块，我想从中提取有效的电子邮件地址并将它们放入一个数组中。到目前为止我有...
$string = file_get_contents("example.txt"); // Load text file contents
$matches = array(); //create array
$pattern = '/[A-Za-z0-9_-]+@[A-Za-z0-9_-]+\.([A-Za-z0-9_-][A-Za-z0-9_]+)/'; //regex for pattern of e-mail address
preg_match($pattern, $string, $matches); //find matching pattern
However, I am getting an array with only one address. Therefore, I am guessing I need to cycle through this process somehow. How do I do that?
但是，我得到一个只有一个地址的数组。因此，我猜我需要以某种方式循环这个过程。我怎么做？
采纳答案by stevendesu
Your code is almost perfect, you just need to replace preg_match(...)with preg_match_all(...)
你的代码几乎完美，你只需要替换preg_match(...)为preg_match_all(...)
http://www.php.net/manual/en/function.preg-match.php
http://www.php.net/manual/en/function.preg-match.php
回答by Clay Hinson
You're pretty close, but the regex wouldn't catch all email formats, and you don't need to specify A-Za-z, you can just use the "i" flag to mark the entire expression as case insensitive. There are email format cases that are missed (especially subdomains), but this catches the ones I tested.
您非常接近，但正则表达式不会捕获所有电子邮件格式，并且您不需要指定 A-Za-z，您只需使用“i”标志将整个表达式标记为不区分大小写。有遗漏的电子邮件格式案例（尤其是子域），但这捕获了我测试过的案例。
$string = file_get_contents("example.txt"); // Load text file contents
// don't need to preassign $matches, it's created dynamically
// this regex handles more email address formats like [email protected], and the i makes it case insensitive
$pattern = '/[a-z0-9_\-\+]+@[a-z0-9\-]+\.([a-z]{2,3})(?:\.[a-z]{2})?/i';
// preg_match_all returns an associative array
preg_match_all($pattern, $string, $matches);
// the data you want is in $matches[0], dump it with var_export() to see it
var_export($matches[0]);
output:
输出：
array (
0 => '[email protected]',
1 => '[email protected]',
2 => '[email protected]',
3 => '[email protected]',
4 => '[email protected]',
)
回答by Eric-Karl
I know this is not the question you asked but I noticed that your regex is not accepting any address like '[email protected]' or any address with a subdomain. You could replace it with something like :
我知道这不是您问的问题，但我注意到您的正则表达式不接受任何地址，如 ' [email protected]' 或任何带有子域的地址。你可以用类似的东西替换它：
/[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}/
which will reject less valid e-mail (although it is not perfect).
这将拒绝不太有效的电子邮件（尽管它并不完美）。
I also suggest you read this article on e-mail validation, it is pretty good and informative.
我还建议您阅读有关电子邮件验证的这篇文章，它非常好且内容丰富。
回答by T.Todua
This detects all mail addresses:
这将检测所有邮件地址：
$sourceeee= 'Here are examplr [email protected] and [email protected] or something more';
preg_match_all('/[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}/i', $sourceeee, $found_mails);
then you can use $found_mails[0]array.
那么你可以使用$found_mails[0]数组。
回答by Rebule
This regex will extract all unique email address from a url or file and output each in new line. It will consider all subdomains and prefix suffix issues. Find comfortable to use it.
此正则表达式将从 url 或文件中提取所有唯一的电子邮件地址，并在新行中输出每个地址。它将考虑所有子域和前缀后缀问题。觉得用起来很舒服。
<?
$url="http://example.com/";
$text=file_get_contents($url);
$res = preg_match_all(
"/[a-z0-9]+[_a-z0-9\.-]*[a-z0-9]+@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})/i",
$text,
$matches
);
if ($res) {
foreach(array_unique($matches[0]) as $email) {
echo $email . "<br />";
}
}
else {
echo "No emails found.";
}
?>
check here for more reference : http://www.php.net/manual/en/function.preg-match-all.php
在这里查看更多参考：http: //www.php.net/manual/en/function.preg-match-all.php
回答by Luis Rodriguez
It worked better for me:
它对我来说效果更好：
<?php
$content = "Hi my name is Joe, I can be contacted at [email protected].";
preg_match("/[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})/i", $content, $matches);
print $matches[0];
?>
Some of the others didn't accept domains like: [email protected]
其他一些不接受域，如：[email protected]
I found it on: http://snipplr.com/view/63938/
回答by fatih
This function works fine without using regex. So it is really faster and low resource hungry.
此函数无需使用正则表达式即可正常工作。所以它真的更快，资源消耗低。
<?php
function extract_email_addresses($str){
$emails = array();
$str = strip_tags( $str );
$str = preg_replace('/\s+/', ' ', $str);
$str = preg_replace("/[\n\r]/", "", $str);
$remove_chars = array (',', "<", ">", ";", "'", ". ");
$str = str_replace( $remove_chars, ' ', $str );
$parts = explode(' ', $str);
if(count($parts) > 0){
foreach($parts as $part){
$part = trim($part);
if( $part != '' ) {
if( filter_var($part, FILTER_VALIDATE_EMAIL) !== false){
$emails[] = $part;
}
}
}
}
if(count($emails) > 0){
return $emails;
}
else{
return null;
}
}
$string = "Guys, please help me to extract valid [email protected] email addresses from some text content using php
example , i have below text content in mysql database ' Life is more beautiful, and i like to explore lot please email me to [email protected]. Learn new things every day. 'from the above text content i want to extract email address '[email protected]' using php regular expressions or other method.";
$matches = extract_email_addresses( $string );
print_r($matches);
?>
