替换两个限制之间的文本

Question

我一直在试图让两个符号之间的文本被替换为preg_replace，但唉，仍然不完全正确，因为我得到一个空字符串的空输出，这就是我所拥有的远

$start = '["'; 
$end = '"]'; 
$msg = preg_replace('#('.$start.')(.*)('.$end.')#si', '$1 test $3', $row['body']); 

所以输出示例我正在寻找将是：

normal text [everythingheregone] after text 

要

normal text [test] after text 

Answer 1

您正在将$ start和$ end定义为数组，但将其用作正常变量。试着改变你的代码如下：

$start = '\['; 
$end = '\]'; 
$msg = preg_replace('#('.$start.')(.*)('.$end.')#si', '$1 test $3', $row['body']); 

Answer 2

$row['body']= "normal text [everythingheregone] after text "; 
$start = '\['; 
$end = '\]'; 
$msg = preg_replace('#'.$start.'.*?'.$end.'#s', '$1 [test] $3', $row['body']); 
//output: normal text [test] after text done 

Answer 3

如何

$str = "normal text [everythingheregone] after text"; 
$repl = "test"; 
$patt = "/\[([^\]]+)\]/"; 
$res = preg_replace($patt, "[". $repl ."]", $str); 

应该产生normal text [test] after text

编辑

小提琴演示here

Answer 4

我有一个正则表达式的方法。正则表达式是：\[.*?]

<?php 
$string = 'normal text [everythingheregone] after text '; 
$pattern = '\[.*?]'; 
$replacement = '[test]' 
echo preg_replace($pattern, $replacement, $string); 
//normal text [test] after text 
?> 

Answer 5

一些功能，可以帮助

function getBetweenStr($string, $start, $end) 
    { 
     $string = " ".$string; 
     $ini = strpos($string,$start); 
     if ($ini == 0) return ""; 
     $ini += strlen($start);  
     $len = strpos($string,$end,$ini) - $ini; 
     return substr($string,$ini,$len); 
    } 

和

function getAllBetweenStr($string, $start, $end) 
    { 
     preg_match_all('/' . preg_quote($start, '/') . '(.*?)' . preg_quote($end, '/') . '/', $string, $matches); 
     return $matches[1]; 
    }