Regular Expressions 101

^start of line

Group 1([0-9]+\n|)

1st Alternative[0-9]+\n

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

2nd Alternative — matches an empty string

Group 2([0-9:,->\s]+)

Character Class[0-9:,->\s]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

,->one character from , (44₁₀) to > (62₁₀)

\sany whitespace character

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^([0-9]+\n|)([0-9:,->\s]+)

Test String
New

1
00:00:04,019 --> 00:00:07,299
line1
line2

2
00:00:07,414 --> 00:00:09,155
line1

00:00:09,276 --> 00:00:11,429
line1

00:00:11,549 --> 00:00:14,874
line1
line2

Regular Expression

Test StringNew

ExtractionProcessing...

Test String
New

Extraction
Processing...