获取php中两个字符之间的字符串答案

【问题标题】：Get string between two characters in php获取php中两个字符之间的字符串
【发布时间】：2014-07-18 09:59:20
【问题描述】：

我在 php 中有一个字符串说

$string = 'All I want to say is that <#they dont really care#> about us.
    I am wasted away <#I made a million mistake#>, am I too late. 
    Theres a storm in my head and a race on my bed, <#when you are not near#>' ;


$expected_output = array(
    'they dont really care',
    'I made a million mistake',
    'when you are not near'
);

如何使用 PHP regex 实现这一点？感谢阅读:)

【问题讨论】：

标签： php regex preg-match preg-match-all pcre

【解决方案1】：

这段代码会做你想做的事

<?php

$string = 'All I want to say is that <#they dont really care#> about us.
    I am wasted away <#I made a million mistake#>, am I too late. 
    Theres a storm in my head and a race on my bed, <#when you are not near#>' ;


preg_match_all('/<#(.*)#>/isU', $string, $matches);

var_dump($matches[1]);

【讨论】：

【解决方案2】：

更紧凑的版本：

$regex = '~<#\K.*?(?=#>)~';
preg_match_all($regex, $string, $matches);
print_r($matches[0]);

查看the regex demo中的匹配项。

匹配项

they dont really care
I made a million mistake
when you are not near

说明

^ 锚断言我们位于字符串的开头
<# 匹配左分隔符
\K 告诉引擎从它返回的最终匹配中删除匹配的内容
.*? 懒惰地将字符匹配到...
前瞻(?=#>) 可以断言后面是#>
$ 锚断言我们在字符串的末尾

参考

【讨论】：

【解决方案3】：

通过前瞻和后瞻，

(?<=<#).*?(?=#>)

最后调用preg_match_all函数打印匹配的字符串。

您的 PHP 代码将是，

<?php
$data = 'All I want to say is that <#they dont really care#> about us.
    I am wasted away <#I made a million mistake#>, am I too late. 
    Theres a storm in my head and a race on my bed, <#when you are not near#>' ;
$regex =  '~(?<=<#).*?(?=#>)~';
preg_match_all($regex, $data, $matches);
var_dump($matches);
?>

输出：

array(1) {
  [0]=>
  array(3) {
    [0]=>
    string(21) "they dont really care"
    [1]=>
    string(24) "I made a million mistake"
    [2]=>
    string(21) "when you are not near"
  }
}

【讨论】：