问题描述：

I\'m trying to get the values ad.test.com and 768 from the string \"adress=ad.test.com

$res = preg_split(\"/^adresse=([a-z]).*port=([0-9]{3})/\", $test) ; 

图片转代码服务由CSDN问答提供

感谢您的意见，我们尽快改进~

功能建议

我正在尝试获取值 ad.test.com </ code>和 来自字符串“adress = ad.test.com

port = 768”</ code>的768 </ code>与此正则表达式但它不起作用：/ </ p>

  $ res = preg_split（“/ ^ adresse =（[az]）。* port =（[0-9] {3}）/”，$ test）;  
</ code> </ pre> 
</ div> 
网友观点：
This should capture the 2 data points you want:
^adress=([a-z.]+).*port=([0-9]{3})
You also want to use this with preg_match, not preg_split.
preg_match(\'/^adress=([a-z.]+).*port=([0-9]{3})/s\', \'adress=ad.test.com
port=768\', $match);
echo $match[1] . \' \' . $match[2];
Demo: https://3v4l.org/Ih929
Notes on why your regex failed:
Character class missing ., and the character class wasn\'t quantified.
adress is in your string but you are looking for addresse in your regex
. doesn\'t match new lines unless the s modifier is used.
Regex demo: https://regex101.com/r/3MSiDh/1/
A more accurate regex that won\'t require s modifier:
^adress=([a-z.]+?)\\s*port=(\\d{3})
Demo 2: https://regex101.com/r/3MSiDh/3/
    
First optimisation, close to your expression:
preg_match(\'/\\badress=([a-z\\.]*)\\s+port=(\\d*)/\',$string,$matches)
It is slightly more generic.  You do not want to match on \'badaddress\' for example, that is what the \\b is for, you might get more than 3 digits for the port, etc, I use \\d in stead of [0-9].
But this regular expression is very strict on the input: the order is fixed, the location of spaces is limited, you can\'t have any unknowns.
To resolve that, I would match on parameter/value pairs, and then act upon each of these pairs.  Further, named matching reduces mistakes with parentheses and future evolutions of the regular expression.
The parameter/value pair match can look like this:
preg_match_all(\'/\\b(?P<param>[^\\d\\s]\\S*)\\s*=\\s*(?P<value>\\S*)(?:\\s|$)/m\',$string,$matches)
This provides $matches[\'param\'] and $matches[\'value\'].  The example below then walks through this list to find the known parameters and check the validity of their values in order to provide some error messages when appropriate.
The code below shows complete code with some test strings.  You can check it out here.
/** Some strings to test our code */
$testStrings=[
\\\"adress=example.com port=464\\\",
\\\"adress =example.com
port=4645\\\",
\\\"port=1  protocol=https adress= example.com\\\",
];
/** Test for each string */
foreach($testStrings as $string) {
print \\\"
TESTING:\'\\\".escapeshellarg($string).\\\"\'
\\\";
/** First method - does not match them all */
if(preg_match(\'/\\badress=([a-z\\.]*)\\s+port=(\\d*)/\',$string,$matches)) {
print \\\"Matched {$matches[1]}:{$matches[2]}
\\\";
}
/** Second method - get param/value pairs first, then check them */
if(preg_match_all(\'/\\b(?P<param>[^\\d\\s]\\S*)\\s*=\\s*(?P<value>\\S*)(?:\\s|$)/m\',$string,$matches)) {
//var_dump($matches); // Uncomment to see the raw data.
$i=0;  // We need an index.
foreach($matches[\'param\'] as $param) {
$value=$matches[\'value\'][$i]; // Put value in local $value
$i++;
switch($param) { // Find parameters we know, complain if needed.
case \\\"adress\\\":
print \\\"ADDRESS IS $value
\\\";
break;
case \\\"port\\\":
if(($result=preg_match(\'/^\\d{3}$/\',$value))) {
var_dump($result);
print \\\"PORT IS $value
\\\";
} else {
print \\\"PORT MUST HAVE EXACTLY 3 DIGITS - Got: $value
\\\";
}
break;
default:
print \\\"UNKNOWN PARAMETER $param=$value
\\\";
}
}
}
}
    
如何使用正则表达式计算1+1,得到预期的值2?
这个本不是正则表达式的活，写个脚本比较好，例如python