3 回答

TA贡献1900条经验 获得超5个赞
\s包括换行符,您想\h用于水平空格并且不要转义正则表达式中的所有字符,它变得不可读:
$html = <<<EOD
<!--{hello}-->
<div class="novalue">
<a>URL</a>
</div>
<!--{/hello}-->
EOD;
echo preg_replace('#\h*<!--({.+?})-->#', '$1', $html);
输出:
{hello}
<div class="novalue">
<a>URL</a>
</div>
{/hello}
解释:
# # regex delimiter
\h* # 0 or more horizontal spaces
<!-- # literally, begin comment
( # start group 1
{ # opening curly brace
.+? # 1 or more any character, not greedy
} # closing curly brace
) # end group 1
--> # literally, end comment
# # regex delimiter
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