regex101: PCRE (Legacy) Match Workspace

\d{3}a digit, repeated exactly 3 times

Negative Lookahead(?!.*?-)

.*?any character (except for line terminators), repeated any number of times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

Downloadthe literal text Download (case sensitive)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

Positive Lookahead(?=\d)

\da digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

\d{3}(?!.*?-)[\s\S]*?Download[\s\S]*?(?=\d)

New

1
00:00:39,243 --> 00:00:45,820
This line is ok

2
00:00:46,243 --> 00:00:51,820
This line with
"Ads" word should be deleted
and its next line

3
00:01:04,243 --> 00:01:05,820
This line with
"Download" word should be deleted
and its next line

4
00:01:08,664 --> 00:01:12,331
An ok line

Substitution

1
00:00:39,243 --> 00:00:45,820
This line is ok

2
00:00:46,243 --> 00:00:51,820
This line with
"Ads" word should be deleted
and its next line

3
00:01:04,243 --> 00:01:05,820
This line with
"Download" word should be deleted
and its next line

4
00:01:08,664 --> 00:01:12,331
An ok line