用于从SIP标头中提取SIP号的正则表达式

Question

Possible SIP from headers:

"unknown-caller-name" <sip:[e-mail]:5066;user=phone>
"Henry Tirta" <sip:[e-mail]>

I need to extract SIP Number between <sip: & @ from the above header in php using regex. This SIP number length will vary.

$from = "\"User Name\" <sip:[e-mail]>";
$matches = array();
$pattern = '/[A-Za-z0-9_-]+@[A-Za-z0-9_-]+\.([A-Za-z0-9_-][A-Za-z0-9_]+)/';
preg_match($pattern,$from,$matches);
$number = explode('@', $matches[0])[0];
echo $number;

Any better way to do this ?

Answer 1

Let's make it simple:

$from = '"unknown-caller-name" <sip:[e-mail]:5066;user=phone>';
if(preg_match('#<sip:(.*?)@#', $from, $id)){
    echo $id[1];
}else{
    echo 'no match';
}

Explanation:

• <sip: : match <sip:
• (.*?) : match and group everything ungreedy until ...
• @ : @ is found/matched.