Regular Expressions 101

^start of line

Group 1([AQ])

Character Class[AQ]

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

Qthe literal Q (81₁₀ / 121₈ / 51₁₆) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Non-Capturing Group(?:.|\n(?![AQ]:))+

+repeats the group contents below at least once:

1st Alternative.

.any character (except for line terminators)

2nd Alternative\n(?![AQ]:)

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

Negative Lookahead(?![AQ]:)

Character Class[AQ]

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

Qthe literal Q (81₁₀ / 121₈ / 51₁₆) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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.

Search reference

Regular Expression

^([AQ]):(?:.|\n(?![AQ]:))+

New

Q: This is a question. 
Q: This is a 2nd question 
on two lines.
A: This is an answer. 
A: This is a 2nd answer 
on two lines.
Q: Here's another question. 
A: And another answer.

Testing.
123.