Regular Expressions 101

^start of line

beginthe literal text begin (case sensitive)

\ban ASCII word boundary

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

Non-Capturing Group(?:\r?\n(?!end|.*\bkey\b).*)*

*repeats the group contents below any number of times:

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

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

Negative Lookahead(?!end|.*\bkey\b)

1st Alternativeend

endthe literal text end (case sensitive)

2nd Alternative.*\bkey\b

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

\ban ASCII word boundary

keythe literal text key (case sensitive)

\ban ASCII word boundary

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

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

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

endthe literal text end (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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^begin\b.*(?:\r?\n(?!end|.*\bkey\b).*)*\r?\nend$

New

begin
test
stuff here
1234
end

begin
other stuff
key
end