PHP正则表达式“未知修饰符p" [英] PHP Regex "Unknown modifier p"

问题描述

// If url matches regex
            $regex = "/^(/upload/temporary/)[0-9]{4}_[0-9]{2}_[0-9]{2}_[A-Za-z0-9._ /-]+.[A-z]{2,4}$/";
        if (preg_match($regex, $this->value)) {

            $this->valid();
        }

错误信息

Warning: preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Unknown modifier 'p' in C:Apachewwwprofiletwistlibphpformurl.php on line 41
Call Stack
#   Time    Memory  Function    Location
1   0.0079  440016  {main}( )   ..
ew.php:0
2   0.0964  667832  form->validate( )   ..
ew.php:60
3   0.0968  668248  form_URL->validateUploadURL( )  ..form.php:372
4   0.0969  668400  preg_match ( )  ..url.php:41
Variables in local scope (#3)

$regex =



string '/^(/upload/temporary/)[0-9]{4}_[0-9]{2}_[0-9]{2}_[A-Za-z0-9._ /-]+.[A-z]{2,4}$/' (length=79)

问题

如何修复正则表达式，以免发生此未知修饰符"错误?

Question

How do I fix the regex for this "unknown modifier" error to not occur?

最终，我想要一个确保文本输入匹配的正则表达式:

ultimately, I would like a regex that makes sure the text input matches:

"/upload/temporary/####_##_##_[A-z0-9 _-]+ "." [a-z]{3}

这是一个文件名目标.开头不会改变，最后一部分可以是随机散列，后跟任意扩展名.在正则表达式之后进行进一步的处理，但这是第一次测试.

This is a filename target. The beginning does not change and the last part can be a random hash followed by an arbitrary extension. Further processing is done after the regex but this is the first test.

谢谢！

推荐答案

在正则表达式字符串中，您必须对分隔符进行转义.或者更好:使用一个没有出现在正则表达式中的字符作为分隔符:

In a regex string you have to escape your delimiters. Or better: use a character which doesn't appear in the regex itself as delimiter:

其他分隔符(推荐):

$regex = "#^(/upload/temporary/)[0-9]{4}_[0-9]{2}_[0-9]{2}_[A-Za-z0-9._ /-]+.[A-z]{2,4}$#";

转义分隔符:

$regex = "/^(/upload/temporary/)[0-9]{4}_[0-9]{2}_[0-9]{2}_[A-Za-z0-9._ /-]+.[A-z]{2,4}$/";

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