regex101: Python Match Workspace

Pro

^start of line

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\s*a Unicode whitespace character, repeated any number of times

ABCthe literal text ABC (case sensitive)

Negated Character Class[^\S\n]*

*matches any number of characters outside the set below:

\Sany character that is not Unicode whitespace

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

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

*repeats the group contents below any number of times:

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

.+any Unicode character (except for line terminators), 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

25 tokens

Regular Expression

^\d+\.\s*ABC[^\S\n]*(?:\n.+)*

New

1. Hello world
1.1 bla bla bla
1.2 more bla bla
1.3 even more bla bla ABC

2. ABC 
2.1 hello ABC
2.2 bla bla bla

3. XYZ
3.1 bla bla
3.2 more bla bla
3.3 even more bla bla

1. Hello world
1.1 bla bla bla
1.2 more bla bla
1.3 even more bla bla ABC

2. XYZ
2.1 bla bla
2.2 more bla bla
2.3 even more bla bla

3. MNO 
3.1 hello MNO
3.2 bla bla bla

4. ABC 
4.1 hello ABC
4.2 bla bla bla

Substitution

1. Hello world
1.1 bla bla bla
1.2 more bla bla
1.3 even more bla bla ABC

2. ABC 
2.1 hello ABC
2.2 bla bla bla

3. XYZ
3.1 bla bla
3.2 more bla bla
3.3 even more bla bla

1. Hello world
1.1 bla bla bla
1.2 more bla bla
1.3 even more bla bla ABC

2. XYZ
2.1 bla bla
2.2 more bla bla
2.3 even more bla bla

3. MNO 
3.1 hello MNO
3.2 bla bla bla

4. ABC 
4.1 hello ABC
4.2 bla bla bla