PHP Regex“Unknown modifier 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();
}
错误讯息
Error Message
Warning: preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Unknown modifier 'p' in C:\Apache\www\profiletwist\lib\php\form\url.php on line 41
Call Stack
# Time Memory Function Location
1 0.0079 440016 {main}( ) ..\new.php:0
2 0.0964 667832 form->validate( ) ..\new.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
如何修复此未知修饰符错误不会发生的正则表达式?
Question
How do I fix the regex for this "unknown modifier" error to not occur?
最后,我想要一个正则表达式,确保文本输入匹配:
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。开始不改变,最后一部分可以是随机散列,后面跟随任意扩展。在正则表达式后进行进一步处理,但这是第一个测试。
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,您必须转义分隔符。或更好:将正则表达式中未出现的字符用作分隔符:
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(建议 em>:
$regex = "#^(/upload/temporary/)[0-9]{4}_[0-9]{2}_[0-9]{2}_[A-Za-z0-9._ /-]+.[A-z]{2,4}$#";
转义分隔符:
escaped delimiters:
$regex = "/^(\/upload\/temporary\/)[0-9]{4}_[0-9]{2}_[0-9]{2}_[A-Za-z0-9._ \/-]+.[A-z]{2,4}$/";
这篇关于PHP Regex“Unknown modifier p”的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!