regex101: JavaScript Match Workspace

^start of line

Non-Capturing Group(?:(?:(?!^) (?:and|or) )?(?:\b[A-Z]|\B$[A-Z](?: (?:and|or) [A-Z])+$\B)){2,}

{2,}repeats the group contents below at least 2 times:

Non-Capturing Group(?:(?!^) (?:and|or) )?

?repeats the group contents below at most once:

Negative Lookahead(?!^)

^start of line

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:and|or)

1st Alternativeand

andthe literal text and (case sensitive)

2nd Alternativeor

orthe literal text or (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:\b[A-Z]|\B$[A-Z](?: (?:and|or) [A-Z])+$\B)

1st Alternative\b[A-Z]

\ban ASCII word boundary

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

2nd Alternative\B$[A-Z](?: (?:and|or) [A-Z])+$\B

\Bnot an ASCII word boundary

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Non-Capturing Group(?: (?:and|or) [A-Z])+

+repeats the group contents below at least once:

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:and|or)

1st Alternativeand

andthe literal text and (case sensitive)

2nd Alternativeor

orthe literal text or (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\Bnot an ASCII word boundary

$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

Search reference

Regular Expression

^(?:(?:(?!^) (?:and|or) )?(?:\b[A-Z]|\B\([A-Z](?: (?:and|or) [A-Z])+\)\B)){2,}$

New

Valid:
A and B and C and D
(A or B) and C
(A or B or C) and D
(A or B or C or D) and E
A and (B or C) and D
A and (B or C) or (C and D)
A or (B and C)
(A and B) or (C and D)

Invalid:
A and B and C and 
(A or B and C
(A or B or C) and D or
(A or B or C or D and E
A and or (B or C) and D
A and (B or (C and D)))
A (B and C)
(A and B) or C and D)
(A and B or C and D)

More Invalid:
A
AB or C
A and 
 or A and B
A and (A)
(A and B) or

Regular Expressions 101

Regular Expression

Substitution