^start of line
Non-Capturing Group(?:
.
(?=
.*+\n
(\1?+.)
.*+\n
(\2?+.)
.*+\n
(\3?+.)
)
)*? *?repeats the group contents below any number of times:
.any character (except for line terminators)
Positive Lookahead(?=
.*+\n
(\1?+.)
.*+\n
(\2?+.)
.*+\n
(\3?+.)
) .*+any character (except for line terminators), repeated any number of times
\na line-feed (newline) character (ASCII 10)
\1?+optionally matches the text saved by group 1
.any character (except for line terminators)
.*+any character (except for line terminators), repeated any number of times
\na line-feed (newline) character (ASCII 10)
\2?+optionally matches the text saved by group 2
.any character (except for line terminators)
.*+any character (except for line terminators), repeated any number of times
\na line-feed (newline) character (ASCII 10)
\3?+optionally matches the text saved by group 3
.any character (except for line terminators)
.any character (except for line terminators)
.any character (except for line terminators)
.any character (except for line terminators)
Athe literal A (6510 / 1018 / 4116) (case sensitive)
.*+any character (except for line terminators), repeated any number of times
\na line-feed (newline) character (ASCII 10)
\1?+optionally matches the text saved by group 1
.any character (except for line terminators)
.any character (except for line terminators)
Athe literal A (6510 / 1018 / 4116) (case sensitive)
.*+any character (except for line terminators), repeated any number of times
\na line-feed (newline) character (ASCII 10)
\2?+optionally matches the text saved by group 2
.any character (except for line terminators)
Athe literal A (6510 / 1018 / 4116) (case sensitive)
.*+any character (except for line terminators), repeated any number of times
\na line-feed (newline) character (ASCII 10)
\3?+optionally matches the text saved by group 3
Athe literal text A (case sensitive) 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
x modifier: extended. Ignores unescaped whitespace and comments outside character classes