Regular Expressions 101

Pro

1st Alternative(?:($(?:[^()]++|(?1))*$)|'[^']*')(*SKIP)(*F)

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

1st Alternative($(?:[^()]++|(?1))*$)

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Non-Capturing 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 ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative(?1)

(?1)calls group 1 as a subroutine

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative'[^']*'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negated Character Class[^']*

*matches any number of characters outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*F)forces the current match attempt to fail at this position

2nd Alternative([+\-*/^])

Group 2([+\-*/^])

Character Class[+\-*/^]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

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

(?:(\((?:[^()]++|(?1))*\))|'[^']*')(*SKIP)(*F)|([+\-*/^])

New

1 + 2 * (3 + (23 + 53 - (132 / 5) + 5) - 1) + 2 / 'test + string' - 52

1 + 2 * (3 + (23 + 53 - (132 / 5) + 5) - 1) + 2 / 'test + string' - 52