从php正则表达式中提取匹配项 [英] Extracting matches from php regex
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问题描述
在perl正则表达式中,我们可以提取匹配的变量,例如下面.
In perl regex we can extract the matched variables, ex below.
# extract hours, minutes, seconds
$time =~ /(\d\d):(\d\d):(\d\d)/; # match hh:mm:ss format
$hours = $1;
$minutes = $2;
$seconds = $3;
如何在php中做到这一点?
How to do this in php?
$subject = "E:contact@customer.com I:100955";
$pattern = "/^E:/";
if (preg_match($pattern, $subject)) {
echo "Yes, A Match";
}
如何从那里提取电子邮件? (我们可以将其爆炸并获得它,但是想要一种直接通过正则表达式获得它的方法)?
How to extract the email from there? (We can explode it and get it...but would like a method to get it directly through regex)?
推荐答案
尝试使用preg_match的命名子模式语法:
Try using the named subpattern syntax of preg_match:
<?php
$str = 'foobar: 2008';
// Works in PHP 5.2.2 and later.
preg_match('/(?<name>\w+): (?<digit>\d+)/', $str, $matches);
// Before PHP 5.2.2, use this:
// preg_match('/(?P<name>\w+): (?P<digit>\d+)/', $str, $matches);
print_r($matches);
?>
输出:
Array (
[0] => foobar: 2008
[name] => foobar
[1] => foobar
[digit] => 2008
[2] => 2008 )
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