Regular Expressions 101

Pro

Non-Capturing Group(?:\G(?!^)\s*,\s*|^N\()

1st Alternative\G(?!^)\s*,\s*

\Gstart of current search

Negative Lookahead(?!^)

^start of line

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

2nd Alternative^N\(

^start of line

Nthe literal N (78₁₀ / 116₈ / 4E₁₆) (case sensitive)

\(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

Non-Capturing Group(?:\d+|\w+($[^()]*(?:(?1)[^()]*)*$))

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative\w+($[^()]*(?:(?1)[^()]*)*$)

\w+any word character, repeated at least once

Group 1($[^()]*(?:(?1)[^()]*)*$)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negated Character Class[^()]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

Non-Capturing Group(?:(?1)[^()]*)*

*repeats the group contents below any number of times:

(?1)calls group 1 as a subroutine

Negated Character Class[^()]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Positive Lookahead(?=\s*,|\)$)

1st Alternative\s*,

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

2nd Alternative\)$

\)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

Detailed match information will be displayed here automatically.

25 tokens

(?:\G(?!^)\s*,\s*|^N\()\K(?:\d+|\w+(\([^()]*(?:(?1)[^()]*)*\)))(?=\s*,|\)$)

New

N(0, 1)
N(N(0.1, 1), 1)
N(U(0, 1), 1)
N(0, T(0, 1))
N(N(0, 1), N(0, 1))