PHP Preg_match 从字幕 srt 文件中删除时间的模式

Question

我需要一个 preg_match 表达式来从 .srt 字幕文件（作为字符串导入）中删除所有时间，但我始终无法完全理解正则表达式模式。因此，例如它会改变：

5
00:05:50,141 --> 00:05:54,771
This is what was said

至

This is what was said

Answer 1

因此考虑到 This is what was said 以大写字母开头并且可以是带有标点符号的文本，我建议如下：

$re = '/.*([A-Z]{1}[A-Za-z0-9 _.,?!"\/\'$]*)/';

$str = '5
00:05:50,141 --> 00:05:54,771
This is what was said.';

preg_match_all($re, $str, $matches, PREG_OFFSET_CAPTURE, 0);

// Print the entire match result
var_dump($matches);

Answer 2

不确定你在哪里卡住了，真的只有 \d+ 和 colon/comma。

$re = '/\d+.\d+:\d+:\d+,\d+\s-->\s\d+:\d+:\d+,\d+./s';
//$re = '\d+.[0-9:,]+\s-->\s[\d+:,]+./s'; //slightly compacter version of the regex
$str = '5
00:05:50,141 --> 00:05:54,771
This is what was said';
$subst = '';

$result = preg_replace($re, $subst, $str);

echo $result;

工作演示 here。
使用更紧凑的模式，它看起来像：https://regex101.com/r/QY9QXG/2

只是为了乐趣和挑战。这是一个非正则表达式的答案。 https://3v4l.org/r7hbO

$str = "1
00:05:50,141 --> 00:05:54,771
This is what was said1

2
00:05:50,141 --> 00:05:54,771
This is what was said2

3
00:05:50,141 --> 00:05:54,771
This is what was said3

4
00:05:50,141 --> 00:05:54,771
This is what was said4
LLLL

5
00:05:50,141 --> 00:05:54,771
This is what was said5";


$count = explode(PHP_EOL.PHP_EOL, $str);

foreach($count as &$line){
    $line =  implode(PHP_EOL, array_slice(explode(PHP_EOL, $line), 2));
}

echo implode(PHP_EOL.PHP_EOL, $count);

非正则表达式将首先拆分成双新行，这意味着每个新的字幕组都是数组中的一个新项目。
然后循环遍历它们并在新行上再次爆炸。
前两行不需要，数组将它们切掉。
如果字幕不止一行，我需要将它们合并。通过在新行上内爆来做到这一点。

然后作为最后一步，在双新行上再次重建字符串。

As Casimir wrote in comments below I have used PHP_EOL as new line and that works in the example.
But when used on a real srt file the new line may be different.
If the code does not work as expected try replacing PHP_EOL with some other new line.

Answer 3

PHP代码：

$str = '5
00:05:50,141 --> 00:05:54,771
This is what was said';
$reg = '/(.{0,}[0,1]{0,}\s{0,}[0-9]{0,}.{0,}[0-9]+[0-9]+:[0-9]{0,}.{0,})/';
echo(trim(preg_replace($reg, '', $str)));

Answer 4

由于 srt 文件始终具有相同的格式，您可以跳过每个行块的前两行，return 到达空行后的结果。为此并避免将整个文件加载到内存中，您可以逐行读取文件并使用生成器：

function getSubtitleLine($handle) {
    $flag = 0;
    $subtitle = '';
    while ( false !== $line = stream_get_line($handle, 1024, "\n") ) {
        $line = rtrim($line);
        if ( empty($line) ) {
            yield $subtitle;
            $subtitle = '';
            $flag = 0;
        } elseif ( $flag == 2 ) {
            $subtitle .= empty($subtitle) ? $line : "\n$line";
        } else {
           $flag++;
        }
    }

    if ( !empty($subtitle) )
        yield $subtitle;
}

if ( false !== $handle = fopen('./test.srt', 'r') ) {
    foreach (getSubtitleLine($handle) as $line) {
        echo $line, PHP_EOL;
    }
}

PHP Preg_match 从字幕 srt 文件中删除时间的模式

PHP Preg_match pattern to remove time from subtitle srt file

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