PHP preg_match 与工作正则表达式 [英] PHP preg_match with working regex

问题描述

function validateDate( $date )
{ 
    echo $date;
    //2012-08-24 20:30:00
    if(preg_match('/^([0-9]{4})-([0-9]{2})-([0-9]{2}) ([1-2]{1})([0-9]{1}):([0-5]{1})([0-9]{1}):([0-5]{1})([0-9]{1})$/', $date) >= 1)
    {
        return true;
    }
    else
    {
        return false;
    }
}

这总是返回 false.我使用了唯一的工具来构建正则表达式，并且在那里运行良好.当我将/"添加到正则表达式时，麻烦就开始了.不知何故，PHP 似乎需要这些，但我不知道为什么，也不知道为什么它会破坏我的正则表达式.

This always returns false. I used an only tool to build the regular expression and it was working fine there. Trouble started when I added the "/" to the regex. Somehow PHP seems to require these but I dont know why and I dont know why it breaks my regex.

它应该为某事返回 TRUE.像2012-08-24 20:30:00"和asdf2012-08-24 20:30:00asdf"或任何不符合我的正则表达式的错误

It should return TRUE for sth. like "2012-08-24 20:30:00" and FALSE for "asdf2012-08-24 20:30:00asdf" or anything thats not acording to my regex

提前致谢！

--------------编辑感谢您的所有回答！

-----------------------EDIT Thanks for all your answers!

正如一些用户指出的那样，我的函数对于示例日期2012-08-24 20:30:00"返回true.但是，只有当我手动设置 $date='2012-08-24 20:30:00' 时它才会这样做.如果我使用完全相同的字符串在代码中的其他地方调用该函数，它将返回 false.有谁知道为什么?

As some users pointed out my function returns true for the sample date "2012-08-24 20:30:00". However it does that only if i manually set $date='2012-08-24 20:30:00'. If i call the function elsewhere in my code with the exact same string it returns false. Does anyone know why?

--------------EDIT2

-----------------------EDIT2

是的，很抱歉浪费您的时间，实际上是在字符串中添加了一些空格.在调用我的函数之前在我的日期使用 trim() 现在给出了正确的结果.

Yea sorry for wasting your time, it was in fact some whitespace that was added to the string. using trim() on my date before calling my function gives the correct result now.

谢谢大家！

推荐答案

为什么要使用正则表达式?使用 DateTime 类.

Why use regex? Use DateTime class.

function validateDate($date, $format = 'Y-m-d H:i:s')
{
    $d = DateTime::createFromFormat($format, $date);
    return $d && $d->format($format) == $date;
}

您可以将此功能用于所有类型的日期/时间验证.示例:

You can use this function for all kind of date/time validations. Examples:

var_dump(validateDate('2012-02-28 12:12:12')); # true
var_dump(validateDate('2012-02-30 12:12:12')); # false
var_dump(validateDate('2012-02-28', 'Y-m-d')); # true
var_dump(validateDate('28/02/2012', 'd/m/Y')); # true
var_dump(validateDate('30/02/2012', 'd/m/Y')); # false
var_dump(validateDate('14:50', 'H:i')); # true
var_dump(validateDate('14:77', 'H:i')); # false
var_dump(validateDate(14, 'H')); # true
var_dump(validateDate('14', 'H')); # true

var_dump(validateDate('2012-02-28T12:12:12+02:00', 'Y-m-dTH:i:sP')); # true
# or
var_dump(validateDate('2012-02-28T12:12:12+02:00', DateTime::ATOM)); # true

var_dump(validateDate('Tue, 28 Feb 2012 12:12:12 +0200', 'D, d M Y H:i:s O')); # true
# or
var_dump(validateDate('Tue, 28 Feb 2012 12:12:12 +0200', DateTime::RSS)); # true
var_dump(validateDate('Tue, 27 Feb 2012 12:12:12 +0200', DateTime::RSS)); # false
# ...

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