Regular Expressions 101

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Non-Capturing Group(?:(?!\[\().)*?

*?repeats the group contents below any number of times:

Negative Lookahead(?!\[\()

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

.any character (except for line terminators)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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.

Search reference

Regular Expression

\[\((?:(?!\[\().)*?\)\]

New

begin [(Mary [(had [(a )]lil' [(lamb [(whose [(fleece )])])])])]was [(white [( as )])]snow
      1      2     3    3     3      4       5         5 4 3 2 1    1       2      2 1
begin [(Mary [(had lil' [(lamb [(whose )])])])]was [(white )]snow
      1      2          3      4        4 3 2 1    1        1
begin [(Mary [(had lil' [(lamb )])])]was snow
      1      2          3       3 2 1
begin [(Mary [(had lil' )])]was snow
      1      2           2 1
begin [(Mary )]was snow
      1       1
begin was snow
begin was snow

Regular Expression

Substitution