Regular Expressions 101

1st Alternative(?=.+?{)[\s\S]+?}

Positive Lookahead(?=.+?{)

.+?any character (except for line terminators), repeated at least once

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Character Class[\s\S]+?

+?matches at least one character from the set below:

\sany whitespace character

\Sany non-whitespace character

}the literal } (125₁₀ / 175₈ / 7D₁₆)

2nd Alternative(?=.+?\[)[\s\S]+?]

Positive Lookahead(?=.+?\[)

.+?any character (except for line terminators), repeated at least once

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Character Class[\s\S]+?

+?matches at least one character from the set below:

\sany whitespace character

\Sany non-whitespace character

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

3rd Alternative[^,[{]+?(?=,)

Negated Character Class[^,[{]+?

+?matches at least one character outside the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Positive Lookahead(?=,)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

(?=.+?{)[\s\S]+?}|(?=.+?\[)[\s\S]+?]|[^,[{]+?(?=,)

New

"name" : "Precalculus",     
"authors" : ["Blitzer","Stewart"],  
"publisher" : { "name" : "McGraw Hill","year" : "2012",
                "city" : ["New York","London","Toronto"]
              }