Regular Expressions 101

Group 1(.*?)

.*?any Unicode character, repeated any number of times

Group 2(-+\n.*?-+(?:\n|\Z))

-+the literal - (45₁₀ / 55₈ / 2D₁₆) , repeated at least once

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

.*?any Unicode character, repeated any number of times

-+the literal - (45₁₀ / 55₈ / 2D₁₆) , repeated at least once

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

1st Alternative\n

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

2nd Alternative\Z

\Zend of string, or before its final line terminator

Group 3(.*?)

.*?any Unicode character, repeated any number of times

Positive Lookahead(?=-+|\Z)

1st Alternative-+

-+the literal - (45₁₀ / 55₈ / 2D₁₆) , repeated at least once

2nd Alternative\Z

\Zend of string, or before its final line terminator

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

s modifier: single line. Allows a dot to match line terminators

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Search reference

Regular Expression

(.*?)(-+\n.*?-+(?:\n|\Z))(.*?)(?=-+|\Z)

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