Regular Expressions 101

1st Alternative$[^()]{1,20}$(*SKIP)(*FAIL)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negated Character Class[^()]{1,20}

{1,20}matches between 1 and 20 characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\)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,

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

\([^()]{1,20}\)(*SKIP)(*FAIL)|,

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