Javascript - return string between square brackets

Use grouping. I've added a ? to make the matching "ungreedy", as this is probably what you want.

var matches = mystring.match(/\[(.*?)\]/);

if (matches) {
    var submatch = matches[1];
}

Since javascript doesn't support captures, you have to hack around it. Consider this alternative which takes the opposite approach. Rather that capture what is inside the brackets, remove what's outside of them. Since there will only ever be one set of brackets, it should work just fine. I usually use this technique for stripping leading and trailing whitespace.

mystring.replace( /(^.*\[|\].*$)/g, '' );

To match any text in between two adjacent open and close square brackets, you can use the following pattern:

\[([^\][]*)]
(?<=\[)[^\][]*(?=])

See the regex demo #1 and regex demo #2. NOTE: The second regex with lookarounds is supported in JavaScript environments that are ECMAScript 2018 compliant. In case older environments need to be supported, use the first regex with a capturing group.

Details:

(?<=\[) - a positive lookbehind that matches a location that is immediately preceded with a [ char (i.e. this requires a [ char to occur immediately to the left of the current position)
[^\][]* - zero or more (*) chars other than [ and ] (note that ([^\][]*) version is the same pattern captured into a capturing group with ID 1)
(?=]) - a positive lookahead that matches a location that is immediately followed with a ] char (i.e. this requires a ] char to occur immediately to the right of the current regex index location).

Now, in code, you can use the following:

const text = "[Some text] ][with[ [some important info]";
console.log( text.match(/(?<=\[)[^\][]*(?=])/g) );
console.log( Array.from(text.matchAll(/\[([^\][]*)]/g), x => x[1]) );
// Both return ["Some text", "some important info"]

Here is a legacy way to extract captured substrings using RegExp#exec in a loop:

var text = "[Some text] ][with[ [some important info]";
var regex = /\[([^\][]*)]/g;
var results=[], m;
while ( m = regex.exec(text) ) {
  results.push(m[1]);
}
console.log( results );

Did you try capturing parens:

("\\[(.*)]");

This should return the pattern within the brackets as a captured match in the returned array

Just use replace and map

"blabla (some info) blabla".match(/\((.*?)\)/g).map(b=>b.replace(/\(|(.*?)\)/g,"$1"))

Javascript - return string between square brackets

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