const regex = /
(?: # ----------
(?= (?&V_Obj) ) # Assertion : Must be a Valid JSON Object
{
| # or ,
(?! ^ ) # Here we are in a valid JSON Object or Array
\G # Continuation anchor, where we last left off
(?&Sep_Obj) \s* # Array Separator
) # ----------
(?: (?&V_KeyVal) (?&Sep_Obj) )*? # Drill down to array or string value
\s* \K # Stop recording
( (?&Str) ) # (1), The key
\s* : \s*
(?| # Branch reset
\[ # Array values = string, numb, bool, or null
( # (2), Array Contents
(?:
\s*
(?:
(?&Numb) # Numbers
| (?> true | false | null ) # Boolean and null
| (?&Str) # String
)
(?&Sep_Ary) # Ary separator
)+
)
\s* \]
| # Or,
( # (2), A Non-Ary, Non-Obj value
(?&Numb) # Numbers
| (?> true | false | null ) # Boolean and null
| (?&Str) # String
)
)
# JSON functions - NoErDet
# ---------------------------------------------
(?(DEFINE)(?<Sep_Ary>\s*(?:,(?!\s*[}\]])|(?=\])))(?<Sep_Obj>\s*(?:,(?!\s*[}\]])|(?=})))(?<Str>(?>"[^\\"]*(?:\\[\s\S][^\\"]*)*"))(?<Numb>(?>[+-]?(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?|(?:[eE][+-]?\d+)))(?<V_KeyVal>(?>\s*(?&Str)\s*:\s*(?&V_Value)\s*))(?<V_Value>(?>(?&Numb)|(?>true|false|null)|(?&Str)|(?&V_Obj)|(?&V_Ary)))(?<V_Ary>\[(?>\s*(?&V_Value)(?&Sep_Ary))*\s*\])(?<V_Obj>{(?>(?&V_KeyVal)(?&Sep_Obj))*\s*}))
/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('
(?: # ----------
(?= (?&V_Obj) ) # Assertion : Must be a Valid JSON Object
{
| # or ,
(?! ^ ) # Here we are in a valid JSON Object or Array
\\G # Continuation anchor, where we last left off
(?&Sep_Obj) \\s* # Array Separator
) # ----------
(?: (?&V_KeyVal) (?&Sep_Obj) )*? # Drill down to array or string value
\\s* \\K # Stop recording
( (?&Str) ) # (1), The key
\\s* : \\s*
(?| # Branch reset
\\[ # Array values = string, numb, bool, or null
( # (2), Array Contents
(?:
\\s*
(?:
(?&Numb) # Numbers
| (?> true | false | null ) # Boolean and null
| (?&Str) # String
)
(?&Sep_Ary) # Ary separator
)+
)
\\s* \\]
| # Or,
( # (2), A Non-Ary, Non-Obj value
(?&Numb) # Numbers
| (?> true | false | null ) # Boolean and null
| (?&Str) # String
)
)
# JSON functions - NoErDet
# ---------------------------------------------
(?(DEFINE)(?<Sep_Ary>\\s*(?:,(?!\\s*[}\\]])|(?=\\])))(?<Sep_Obj>\\s*(?:,(?!\\s*[}\\]])|(?=})))(?<Str>(?>"[^\\\\"]*(?:\\\\[\\s\\S][^\\\\"]*)*"))(?<Numb>(?>[+-]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)(?:[eE][+-]?\\d+)?|(?:[eE][+-]?\\d+)))(?<V_KeyVal>(?>\\s*(?&Str)\\s*:\\s*(?&V_Value)\\s*))(?<V_Value>(?>(?&Numb)|(?>true|false|null)|(?&Str)|(?&V_Obj)|(?&V_Ary)))(?<V_Ary>\\[(?>\\s*(?&V_Value)(?&Sep_Ary))*\\s*\\])(?<V_Obj>{(?>(?&V_KeyVal)(?&Sep_Obj))*\\s*}))
', 'gm')
const str = `{
"key1":
["value1","value2","value3","value4","value5",3.14,null],
"key_complex_skip":
["valuec", {"subkey": [null,null,34.123] } ],
"key2":
null,
"key3":
"value8"
}
`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions