Regular Expressions 101

1st Alternative$[^)]+\d{4}$(*SKIP)(*FAIL)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negated Character Class[^)]+

+matches at least one character outside the set below:

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\d{4}a digit, repeated exactly 4 times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*FAIL)forces the current match attempt to fail at this position

2nd Alternative\S.*?(?=\s*(?:$[^)]+\d{4}$|$))

\Sany non-whitespace character

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

Positive Lookahead(?=\s*(?:$[^)]+\d{4}$|$))

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

Non-Capturing Group(?:$[^)]+\d{4}$|$)

1st Alternative$[^)]+\d{4}$

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negated Character Class[^)]+

+matches at least one character outside the set below:

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\d{4}a digit, repeated exactly 4 times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative$

$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

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Search reference

Regular Expression

\([^)]+\d{4}\)(*SKIP)(*FAIL)|\S.*?(?=\s*(?:\([^)]+\d{4}\)|$))

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