Найти шаблон с использованием sed и вставить «текст» в начало следующей строки.

*.srt файл субтитров

00:00:00;00 —-> 00:00:00;01
Текст 01 субтитра
Другой текст 02

• Я хотел бы вставить текст в начале строки:
  Текст 01 субтитра
  и
• Другой текст в конце строки:
  Другой текст 02

Все, что я нашел, показывает, как
добавить спереди или сзади.

Я не хочу добавлять строки.
Просто вставить текст (но сохраняя строки)

Используя Raku (ранее известный как Perl_6)

~$ raku -e 'my @array = slurp.chomp.split("\n\n");                                  \
            for @array {                                                            \
                put S/^ [\N+]**2 %% "\n" <( ^^ .* $/PREPENDED<--$/-->APPENDED\n/    \
            };' file.srt

Пример ввода (из gist.github.com/matibzurovski/d690d5c14acbaa399e7f0829f9d6888e ):

1
00:00:00,000 --> 00:00:02,500
Welcome to the Example Subtitle File!

2
00:00:03,000 --> 00:00:06,000
This is a demonstration of SRT subtitles.

3
00:00:07,000 --> 00:00:10,500
You can use SRT files to add subtitles to your videos.

4
00:00:12,000 --> 00:00:15,000
Each subtitle entry consists of a number, a timecode,
and the subtitle text.

5
00:00:16,000 --> 00:00:20,000
The timecode format is hours:minutes:seconds,milliseconds.

6
00:00:21,000 --> 00:00:25,000
You can adjust the timing to match your video.

7
00:00:26,000 --> 00:00:30,000
Make sure the subtitle text is clear and readable.

8
00:00:31,000 --> 00:00:35,000
And that's how you create an SRT subtitle file!

9
00:00:36,000 --> 00:00:40,000
Enjoy adding subtitles to your videos!

Пример вывода:

1
00:00:00,000 --> 00:00:02,500
PREPENDED<--Welcome to the Example Subtitle File!-->APPENDED

2
00:00:03,000 --> 00:00:06,000
PREPENDED<--This is a demonstration of SRT subtitles.-->APPENDED

3
00:00:07,000 --> 00:00:10,500
PREPENDED<--You can use SRT files to add subtitles to your videos.-->APPENDED

4
00:00:12,000 --> 00:00:15,000
PREPENDED<--Each subtitle entry consists of a number, a timecode,
and the subtitle text.-->APPENDED

5
00:00:16,000 --> 00:00:20,000
PREPENDED<--The timecode format is hours:minutes:seconds,milliseconds.-->APPENDED

6
00:00:21,000 --> 00:00:25,000
PREPENDED<--You can adjust the timing to match your video.-->APPENDED

7
00:00:26,000 --> 00:00:30,000
PREPENDED<--Make sure the subtitle text is clear and readable.-->APPENDED

8
00:00:31,000 --> 00:00:35,000
PREPENDED<--And that's how you create an SRT subtitle file!-->APPENDED

9
00:00:36,000 --> 00:00:40,000
PREPENDED<--Enjoy adding subtitles to your videos!-->APPENDED

ПРИМЕЧАНИЕ: Для лучшего понимания происходящего, знайте, что slurp читает файл целиком, включая новые строки. Затем вы используете “большую-S” S/// для замены, пропуская две строки с помощью ^ [\N+]**2 %% "\n". Маркер захвата Raku <( отбрасывает все слева, позволяя заменять только текст субтитров (в Raku $/ — переменная совпадения).

Вот как выглядит @array после разделения по \n\n:

raku -e 'my @array = slurp.chomp.split("\n\n"); for @array { .raku.say};'   file.srt
"1\n00:00:00,000 --> 00:00:02,500\nWelcome to the Example Subtitle File!"
"2\n00:00:03,000 --> 00:00:06,000\nThis is a demonstration of SRT subtitles."
"3\n00:00:07,000 --> 00:00:10,500\nYou can use SRT files to add subtitles to your videos."
"4\n00:00:12,000 --> 00:00:15,000\nEach subtitle entry consists of a number, a timecode,\nand the subtitle text."
"5\n00:00:16,000 --> 00:00:20,000\nThe timecode format is hours:minutes:seconds,milliseconds."
"6\n00:00:21,000 --> 00:00:25,000\nYou can adjust the timing to match your video."
"7\n00:00:26,000 --> 00:00:30,000\nMake sure the subtitle text is clear and readable."
"8\n00:00:31,000 --> 00:00:35,000\nAnd that's how you create an SRT subtitle file!"
"9\n00:00:36,000 --> 00:00:40,000\nEnjoy adding subtitles to your videos!"

https://raku.org