如果未找到,则在末尾添加字符的正则表达式

时间:2015-12-28 09:07:34

标签: php regex

我将例程时间存储在数据库表中4-6;6-7。现在我想解析它并以下列格式显示。我可以使用循环多次爆炸来完成它。但我认为可以用正则表达式完成。我希望输出看起来像这样:

如果数据为4-6;6-7,则输出应为:

 4:00 - 6:00
 6:00 - 7:00

如果数据为4:30-6:30;6-7:30,则输出应为:

 4:30 - 6:30
 6:00 - 7:30

3 个答案:

答案 0 :(得分:1)

不是正则表达式,但结果相同:(爱explode - 一些屎)

<?php
$str = '4-6;6-7';

$two_t = explode(';',$str);
$first_t = explode('-',$two_t[0]);
$second_t = explode('-',$two_t[1]);

$time = setMinutes($first_t[0]) .'-'.setMinutes($first_t[1]) ."<br/>". setMinutes($second_t[0]) .'-'. setMinutes($second_t[1]);
echo $time;

function setMinutes($time){
    $quarter = explode(':',$time);
    $hour = $quarter[0];
    if(!isset($quarter[1])){
        $minutes = '00';
    }else{
        $minutes = $quarter[1];
    }
    return "$hour:$minutes";
}
?>

输出:

4:00-6:00
6:00-7:00

<强>已更新

根据要求,使用正则表达式:

$str = '4:30-6:30;6-7:30';
echo formatTime($str);

echo "\n\n";

$str = '4-6;6-7';
echo formatTime($str);


function formatTime($str) {
    // get all match per group separating each time and minute
    preg_match_all('/(\d(:\d\d)?)-(\d(:\d\d)?);(\d(:\d\d)?)-(\d(:\d\d)?)/', $str, $matches);

    // remove the whole match
    unset($matches[0]);

    // loop through the matches and check if minutes(in even keys) exists
    foreach ($matches as $key => $value) {
        if ($key % 2 == 0) {
            $matches[$key - 1][0] = (strlen($value[0]) == 0) ? $matches[$key - 1][0] . ':00' : $matches[$key - 1][0];
        }
    }

    // combine all the time in odd keys
    return $matches[1][0] . '-' . $matches[3][0] . "\n" . $matches[5][0] . '-' . $matches[7][0];
}

输出:

4:30-6:30
6:00-7:30

4:00-6:00
6:00-7:00

答案 1 :(得分:1)

您可以使用(?&lt;&#39; NAME&#39;&gt; SUB_PATTERN)访问任何模式组。 结果是一个包含&#39; NAME&#39;的数组。索引。

<?php

$date = "4:30-6:30;6-7:30";
// $date = "4-6;6-7";
$result = '';
$pattern = '/^(?<a>.*)-(?<b>.*);(?<c>.*)-(?<d>.*)$/';
preg_match($pattern , $date , $matches);


$pattern2 = '/^\s*((?<h2>\d+)|(?<h1>\d+:\d+))\s*$/';

preg_match($pattern2 , $matches['a'] , $match);
$result .= ((isset($match['h1'])) ? $match['h1'] : $match['h2'].':00');
$result .= ' - ';
preg_match($pattern2 , $matches['b'] , $match);
$result .= ((isset($match['h1'])) ? $match['h1'] : $match['h2'].':00');

$result .=  '<br />';

preg_match($pattern2 , $matches['c'] , $match);
$result .= ((isset($match['h1'])) ? $match['h1'] : $match['h2'].':00');
$result .= ' - ';
preg_match($pattern2 , $matches['d'] , $match);
$result .= ((isset($match['h1'])) ? $match['h1'] : $match['h2'].':00');


echo $result;

答案 2 :(得分:-1)

为什么不使用替换功能? str_replace函数( “ - ”, “:”,$字符串); str_replace(“;”,“ - ”,$ string);

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