Regular Expressions 101

Group 1(\d+\.\s.*(?:\r\n?|\n)+)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\sany whitespace character

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

Non-Capturing Group(?:\r\n?|\n)+

+repeats the group contents below at least once:

1st Alternative\r\n?

\ra carriage return (ASCII 13)

\n?optionally matches a line-feed (newline) character (ASCII 10)

2nd Alternative\n

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

Non-Capturing Group(?:\r\n?|\n)

1st Alternative\r\n?

\ra carriage return (ASCII 13)

\n?optionally matches a line-feed (newline) character (ASCII 10)

2nd Alternative\n

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

Positive Lookahead(?=•\s{3})

•the literal • (8226₁₀ / 20042₈ / 2022₁₆)

\s{3}any whitespace character, repeated exactly 3 times

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.

26 tokens

Regular Expression

(\d+\.\s.*(?:\r\n?|\n)+)(?:\r\n?|\n)(?=•\s{3})

New

1.  Hello


•   World

$1

1.  Hello


•   World