regex101: JavaScript Match Workspace

Group 1((\d\d:){2}\d\d,\d\d\d| --> )+

+repeats the group contents below at least once:

1st Alternative(\d\d:){2}\d\d,\d\d\d

Group 2(\d\d:){2}

{2}repeats the group contents below exactly 2 times:

\da digit

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\da digit

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\da digit

2nd Alternative -->

--> the literal text -->

Positive Lookahead(?=(?:$\n.+)+chemical)

Non-Capturing Group(?:$\n.+)+

+repeats the group contents below at least once:

$end of line

\na line-feed (newline) character (ASCII 10)

.+any character (except for line terminators), repeated at least once

chemicalthe literal text chemical (case sensitive)

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

26 tokens

Regular Expression

((\d\d:){2}\d\d,\d\d\d| --> )+(?=(?:$\n.+)+chemical)

New

"1
00:01:46,356 --> 00:01:49,893
What is this? It's blue.

2
00:01:50,794 --> 00:01:54,998
We used a different chemical process,
but it is every bit as pure.

3
00:01:55,199 --> 00:01:58,267
It may be blue, but it's the bomb."

Substitution

"1
00:01:46,356 --> 00:01:49,893
What is this? It's blue.

2
00:01:50,794 --> 00:01:54,998
We used a different chemical process,
but it is every bit as pure.

3
00:01:55,199 --> 00:01:58,267
It may be blue, but it's the bomb."