php 正则表达式,获取两个字符之间的字符串值
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Regex, get string value between two characters
提问by Johannes
I'd like to return string between two characters, @ and dot (.).
我想返回两个字符之间的字符串,@ 和点 (.)。
I tried to use regex but cannot find it working.
我尝试使用正则表达式,但找不到它的工作原理。
(@(.*?).)
Anybody?
有人吗?
回答by Mark Byers
Your regular expression almost works, you just forgot to escape the period. Also, in PHP you need delimiters:
您的正则表达式几乎有效,您只是忘记转义句号。另外,在 PHP 中你需要分隔符:
'/@(.*?)\./s'
The s is the DOTALL modifier.
s 是DOTALL 修饰符。
Here's a complete example of how you could use it in PHP:
这是一个关于如何在 PHP 中使用它的完整示例:
$s = '[email protected]';
$matches = array();
$t = preg_match('/@(.*?)\./s', $s, $matches);
print_r($matches[1]);
Output:
输出:
bar
回答by Gumbo
Try this regular expression:
试试这个正则表达式:
@([^.]*)\.
The expression [^.]*will match any number of any character other than the dot. And the plain dot needs to be escaped as it's a special character.
该表达式[^.]*将匹配除点以外的任意数量的任何字符。普通点需要转义,因为它是一个特殊字符。
回答by Geert
If you're learning regex, you may want to analyse those too:
如果您正在学习正则表达式,您可能也想分析这些:
@\K[^.]++(?=\.)
(?<=@)[^.]++(?=\.)
Both these regular expressions use possessive quantifiers (++). Use them whenever you can, to prevent needless backtracking. Also, by using lookaround constructions (or \K), we can match the part between the @and the .in $matches[0].
这两个正则表达式都使用所有格量词 ( ++)。尽可能使用它们,以防止不必要的回溯。此外,通过使用环视结构(或\K),我们可以匹配in@和.in之间的部分$matches[0]。
回答by Dièse
this is the best and fast to use
这是最好的和快速的使用
function get_string_between ($str,$from,$to) {
$string = substr($str, strpos($str, $from) + strlen($from));
if (strstr ($string,$to,TRUE) != FALSE) {
$string = strstr ($string,$to,TRUE);
}
return $string;
}

