Regular Expressions 101

(?s)applies the following effective flags to the remainder of the pattern: gs

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

Positive Lookahead(?=OPERATION\s*\()

OPERATIONthe literal text OPERATION (case sensitive)

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Non-Capturing Group(?:(?=.*?OPERATION\s*$(?!.*?\1)(.*$(?!.*\2).*))(?=.*?\)(?!.*?\2)(.*)).)+?

+?repeats the group contents below at least once:

Positive Lookahead(?=.*?OPERATION\s*$(?!.*?\1)(.*$(?!.*\2).*))

.*?any character, repeated any number of times

OPERATIONthe literal text OPERATION (case sensitive)

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negative Lookahead(?!.*?\1)

.*?any character, repeated any number of times

\1the text saved by group 1

Group 1(.*\)(?!.*\2).*)

.*any character, repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Negative Lookahead(?!.*\2)

.*any character, repeated any number of times

\2the text saved by group 2

.*any character, repeated any number of times

Positive Lookahead(?=.*?\)(?!.*?\2)(.*))

.*?any character, repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Negative Lookahead(?!.*?\2)

.*?any character, repeated any number of times

\2the text saved by group 2

Group 2(.*)

.*any character, repeated any number of times

.any character

.*?any character, repeated any number of times

Positive Lookahead(?=\1)

\1the text saved by group 1

Non-Capturing Group(?:(?!OPERATION\s*\().)*

*repeats the group contents below any number of times:

Negative Lookahead(?!OPERATION\s*\()

OPERATIONthe literal text OPERATION (case sensitive)

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

.any character

Positive Lookahead(?=\2$)

\2the text saved by group 2

$end of string, or before its final line terminator

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

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Search reference

Regular Expression

(?s)(?=OPERATION\s*\()(?:(?=.*?OPERATION\s*\((?!.*?\1)(.*\)(?!.*\2).*))(?=.*?\)(?!.*?\2)(.*)).)+?.*?(?=\1)(?:(?!OPERATION\s*\().)*(?=\2$)

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