Regular Expressions 101

Explanation

Pro

Non-Capturing Group(?:\G(?!^)|\()

1st Alternative\G(?!^)

\Gstart of current search

Negative Lookahead(?!^)

^start of line

2nd Alternative\(

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negated Character Class[^)(]*+

*+matches any number of characters outside the set below:

)the literal ) (41₁₀ / 51₈ / 29₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

Group 1(\(((?>[^)(]+|(?1))*)\))

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 2((?>[^)(]+|(?1))*)

Atomic Group(?>[^)(]+|(?1))*

*repeats the group contents below any number of times:

1st Alternative[^)(]+

Negated Character Class[^)(]+

+matches at least one character outside the set below:

)the literal ) (41₁₀ / 51₈ / 29₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

2nd Alternative(?1)

(?1)calls group 1 as a subroutine

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?:\G(?!^)|\()[^)(]*+\K(\(((?>[^)(]+|(?1))*)\))

New

Record ID
What is the best food? (choice=Nachos)
What is the best food? (choice=Tacos (big bent nachos))
What is the best food? (choice=Chips with stuff) 
Complete?

So ((this) one (has) (many) (inside)) (none here) (but (here) and (here))

Deeper nesting: (l0 (l1 (l2) l1 (l2) l1)) out (a (b) (b) a ((c) b)) out (no)

Substitution

$2

Record ID
What is the best food? (choice=Nachos)
What is the best food? (choice=Tacos (big bent nachos))
What is the best food? (choice=Chips with stuff) 
Complete?

So ((this) one (has) (many) (inside)) (none here) (but (here) and (here))

Deeper nesting: (l0 (l1 (l2) l1 (l2) l1)) out (a (b) (b) a ((c) b)) out (no)