在PHP preg_replace函数中包括换行 [英] Including new lines in PHP preg_replace function

问题描述

我正在尝试匹配可能出现在多行上的字符串.它以特定的字符串开头和结尾:

I'm trying to match a string that may appear over multiple lines. It starts and ends with a specific string:

{a}some string
can be multiple lines
{/a}

我可以用正则表达式获取{a}和{/a}之间的所有内容吗?看来.与换行符不匹配，但是我尝试了以下操作而没有运气:

Can I grab everything between {a} and {/a} with a regex? It seems the . doesn't match new lines, but I've tried the following with no luck:

$template = preg_replace( $'/\{a\}([.\n]+)\{\/a\}/', 'X', $template, -1, $count );
echo $count; // prints 0

它匹配.或\ n独自一人，但不在一起时！

It matches . or \n when they're on their own, but not together!

推荐答案

使用 s修饰符:

$template = preg_replace( $'/\{a\}([.\n]+)\{\/a\}/s', 'X', $template, -1, $count );
//                                                ^
echo $count;

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