regex101: Python Match Workspace

Pro

^start of line

#EXT-X-PROGRAM-DATE-TIME:the literal text #EXT-X-PROGRAM-DATE-TIME: (case sensitive)

Group 1(.*)

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

Non-Capturing Group(?:\n(?!seg\d+\.ts$).*)*

*repeats the group contents below any number of times:

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

Negative Lookahead(?!seg\d+\.ts$)

segthe literal text seg (case sensitive)

\d+a Unicode decimal digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

tsthe literal text ts (case sensitive)

$end of line

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

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

seg2the literal text seg2 (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

tsthe literal text ts (case sensitive)

$end of line

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

^#EXT-X-PROGRAM-DATE-TIME:(.*)(?:\n(?!seg\d+\.ts$).*)*\nseg2\.ts$

New

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:7
#EXT-X-MEDIA-SEQUENCE:0

#EXT-X-PROGRAM-DATE-TIME:2022-09-12T10:03:22.621+02:00
#EXTINF:6.666666667,
seg1.ts
#EXT-X-PROGRAM-DATE-TIME:2022-09-12T10:03:29.637+02:00
#EXTINF:6.666666667,
seg2.ts
#EXT-X-PROGRAM-DATE-TIME:2022-09-12T10:03:36.583+02:00
#EXTINF:6.666666666,
seg3.ts

Substitution

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:7
#EXT-X-MEDIA-SEQUENCE:0

#EXT-X-PROGRAM-DATE-TIME:2022-09-12T10:03:22.621+02:00
#EXTINF:6.666666667,
seg1.ts
#EXT-X-PROGRAM-DATE-TIME:2022-09-12T10:03:29.637+02:00
#EXTINF:6.666666667,
seg2.ts
#EXT-X-PROGRAM-DATE-TIME:2022-09-12T10:03:36.583+02:00
#EXTINF:6.666666666,
seg3.ts