Regular Expressions 101

Pro

^start of line

Group 1(\d+)

\d+a digit, repeated at least once

\r?optionally matches a carriage return (ASCII 13)

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

Negative Lookahead(?!\*{1,}END\*{1,})

\*{1,}the literal * (42₁₀ / 52₈ / 2A₁₆) , repeated at least once

ENDthe literal text END (case sensitive)

\*{1,}the literal * (42₁₀ / 52₈ / 2A₁₆) , repeated at least once

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

Detailed match information will be displayed here automatically.

25 tokens

^(\d+)\r?\n(?!\*{1,}END\*{1,})

New

abc
1
2
3
4
5
***END***
abc
6
7
8
9
***END***
abc
10
11
12
***END***

abc
1
2
3
4
5
***END***
abc
6
7
8
9
***END***
abc
10
11
12
***END***