PHP regular matching date and time program code_PHP tutorial

Today I want to replace a database. I need to extract the date and time from the specified string in the database and then convert the timestamp. My field is a character with date. The matching time format is 2012-02-16 or 2012-02-16. 23:59:59 You don’t need to write it when the front is 0. Later I found some test code

and posted the code below:

The code is as follows

代码如下	复制代码
//匹配时间格式为2012-02-16或2012-02-16 23:59:59前面为0的时候可以不写 $time = "2012-02-16 23:59:59"; $patten = "/^d{4}[-](0?[1-9]|1[012])[-](0?[1-9]|[12][0-9]|3[01])(s+(0?[0-9]|1[0-9]|2[0-3]):(0?[0-9]|[1-5][0-9]):(0?[0-9]|[1-5][0-9]))?$/"; if (preg_match ( $patten, $time )) { echo $timestro = strtotime ( $time ); } else { echo "error"; } ?>

Copy code

代码如下	复制代码
/^d{4}[-](0?[1-9]|1[012])[-](0?[1-9]|[12][0-9]|3[01])(s+(0?[0-9]|[12][0-3]):(0?[0-9]|[1-5][1-9]):(0?[0-9]|[1-5][1-9]))?$/

//The matching time format is 2012-02-16 or 2012-02-16 23:59:59. You don’t need to write it when the front is 0
$time = "2012-02-16 23:59:59";
$patten = "/^d{4}[-](0?[1-9]|1[012])[-](0?[1-9]|[12][0-9]|3[ 01])(s+(0?[0-9]|1[0-9]|2[0-3]):(0?[0-9]|[1-5][0-9]): (0?[0-9]|[1-5][0-9]))?$/";
if (preg_match ( $patten, $time )) {
echo $timestro = strtotime ( $time );
} else {
echo "error";
}

?>

Analysis of this regular rule:

The code is as follows

Copy code

/^d{4}[-](0?[1-9]|1[012])[-](0?[1-9]|[12][0-9]|3[01 ])(s+(0?[0-9]|[12][0-3]):(0?[0-9]|[1-5][1-9]):(0?[0- 9]|[1-5][1-9]))?$/

代码如下

复制代码

<br> <?php <br /> $str="嘿嘿2010/07/08 12:31:56哈哈1999/12/31 13:21:45";<br /> $str2="嘿嘿2010-07-08 12:31:56哈哈1999-12-31 13:21:45";<br /> //仅匹配日期<br /> preg_match_all("/d{4}/d{2}/d{2}/", $str, $arr);<br /> preg_match_all("/d{4}-d{2}-d{2}/", $str2, $arr2);<br /> //匹配日期与时间<br /> preg_match_all("/d{4}/d{2}/d{2}sd{2}:d{2}:d{2}/", $str, $arr3);<br /> preg_match_all("/d{4}-d{2}-d{2}sd{2}:d{2}:d{2}/", $str2, $arr4);<br /> echo '<font color="red">匹配日期</font><br>';<br> print_r($arr);<br> print_r($arr2);<br> echo '<font color="red">匹配日期和时间</font><br>';<br> print_r($arr3);<br> print_r($arr4);<br> ?><br>

/ is the start symbol of the expression and the last / is the end symbol of the expression

^The beginning of the string, starting with ***

$ represents the end of the string, which means it has ended | means or () represents a unit d{4} matches a 4-digit number, (-) matches a "-" sign, (0?[1-9]|1[012]) matches the month, (0?[1-9]|[12][0-9]|3[01]) matches the day, (s+(0?[0-9]|1[0-9]|2[0-3]):(0?[0-9]|[1-5][0-9]): (0?[0-9]|[1-5][0-9]))? The minutes and seconds part of the entire matching time, ? means yes or no. The last step is to convert the timestamp of the successful match

The current conversion result is: 1329407999

Attached is an example I wrote myself

The code is as follows

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<?php <🎜> $str="Hey 2010/07/08 12:31:56 Haha 1999/12/31 13:21:45";<🎜> $str2="Hey 2010-07-08 12:31:56 Haha 1999-12-31 13:21:45";<🎜> //Only match dates<🎜> preg_match_all("/d{4}/d{2}/d{2}/", $str, $arr);<🎜> preg_match_all("/d{4}-d{2}-d{2}/", $str2, $arr2);<🎜> //Match date and time<🎜> preg_match_all("/d{4}/d{2}/d{2}sd{2}:d{2}:d{2}/", $str, $arr3);<🎜> preg_match_all("/d{4}-d{2}-d{2}sd{2}:d{2}:d{2}/", $str2, $arr4);<🎜> echo '<font color="red">match date</font><br>'; print_r($arr); print_r($arr2); echo '<font color="red">match date and time</font><br>'; print_r($arr3); print_r($arr4); ?> http://www.bkjia.com/PHPjc/631254.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631254.htmlTechArticleToday I want to replace a database and take out the date and time in the specified string in the database and then convert the timestamp. , my field is a character with date and the matching time format is 2012-02-16 or...