regex101: JavaScript Match Workspace

^start of line

Negative Lookahead(?!$[^()\n]*$$|.*([()])[^()\n]*(?=\1)|[^()\n]*[()](?:[^()\n]*[()][^()\n]*[()])*[^()\n]*$|.*$[A-Z]$)

1st Alternative$[^()\n]*$$

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negated Character Class[^()\n]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

$end of line

2nd Alternative.*([()])[^()\n]*(?=\1)

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

Group 1([()])

Character Class[()]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

Negated Character Class[^()\n]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

Positive Lookahead(?=\1)

\1the text saved by group 1

3rd Alternative[^()\n]*[()](?:[^()\n]*[()][^()\n]*[()])*[^()\n]*$

Negated Character Class[^()\n]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

Character Class[()]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

Non-Capturing Group(?:[^()\n]*[()][^()\n]*[()])*

*repeats the group contents below any number of times:

Negated Character Class[^()\n]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

Character Class[()]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

Negated Character Class[^()\n]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

Character Class[()]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

Negated Character Class[^()\n]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

$end of line

4th Alternative.*$[A-Z]$

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Character Class[A-Z]

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

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\(?optionally matches 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 any number of times:

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)

\(?optionally matches the literal ( (40₁₀ / 50₈ / 28₁₆)

Character Class[A-Z]

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

\)?optionally matches the literal ) (41₁₀ / 51₈ / 29₁₆)

$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

^(?!\([^()\n]*\)$|.*([()])[^()\n]*(?=\1)|[^()\n]*[()](?:[^()\n]*[()][^()\n]*[()])*[^()\n]*$|.*\([A-Z]\))\(?[A-Z](?: (?:and|or) \(?[A-Z]\)?)*$

New

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)
A

A and (B) and C
A and B)
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)

Regular Expressions 101

Regular Expression

Substitution