使用php preg_replace_callback - 但替换整个字符串而不是每个子字符串

Question

Hi I hope someone can help, as not too hot on regular expressions.

Got a script snippet as follows..

<?php

$news="test message {image=abc} more text text text {image=def}";

$news=preg_replace_callback("/\{image=.*\}/i",function ($matches) { $field=$matches[0];  return "*".$field."*"; }, $news);


echo $news;

?>

However when i run it, it returns

test message *{image=abc} more text text text {image=def}*

Instead I want it to return..

test message *{image=abc}* more text text text *{image=def}*

Thanks for any help.

Answer 1

Make your regex non-greedy by using .*? instead of .*:

$news = "test message {image=abc} more text text text {image=def}";
$news = preg_replace_callback("/\{image=.*?\}/i",function ($matches) { 
                 return "*".$matches[0]."*"; }, $news);

echo $news;

OUTPUT

test message *{image=abc}* more text text text *{image=def}*