PHP：preg_match - “分隔符不能是字母数字或反斜杠”
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PHP: preg_match - "Delimiter must not be alphanumeric or backslash"
提问by Stan
Does anyone know what is wrong with this regex? It works fine on sites like RegexPal and RegExr, but in PHP it gives me this warning and no results:
有谁知道这个正则表达式有什么问题？它在 RegexPal 和 RegExr 等网站上运行良好，但在 PHP 中它给了我这个警告但没有结果：
Warning: preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash
Here's my code:
这是我的代码：
preg_match('name="dsh" id="dsh" value="(.*?)"', 'name="dsh" id="dsh" value="123"', $matches);
回答by Michael Berkowski
You have no delimiter. Enclose the pattern in /
您没有分隔符。将图案放入/
preg_match('/name="dsh" id="dsh" value="(.*?)"/', 'name="dsh" id="dsh" value="123"', $matches);
For patterns that include /on their own, it is advisable to use a different delimiter like ~or #to avoid escaping:
对于单独包含的模式，/建议使用不同的分隔符，例如~或#避免转义：
// Delimited with # instead of /
preg_match('#name="dsh" id="dsh" value="(.*?)"#', 'name="dsh" id="dsh" value="123"', $matches);
回答by Paul
You need delimiters:
您需要分隔符：
preg_match('/name="dsh" id="dsh" value="(.*?)"/', 'name="dsh" id="dsh" value="123"', $matches);
