Regex matching key value pairs inside curly brackets-CodePudding

I’m trying to capture key:value pairs inside curly brackets. For the following string it should return something like k2:v2 and k3:v3

Str = “k1:v1abc{k2:v2,k3:v3}{test}”

I have the following regexes which capture what I need individually, but I don’t know how to combine them together.

/(\w ):(\w )/g >>> Captures key:value /{.*?}/g >>> Captures everything between {}

CodePudding user response：

If the pair is only inside one set, then you can use split

const str = `k1:v1abc{k2:v2,k3:v3}{test}`
console.log(str.split("{")[1].split("}")[0].split(","))

CodePudding user response：

If your environment supports a quantifier in a lookbehind assertion:

(?<={[\w:,]*)\w :\w (?=[\w:,]*})

The pattern matches:

(?<={[\w:,]*) Positive lookbehind, assert { and optional repetitions of the allowed chars to the left
\w :\w Match 1 word chars : and 1 word chars
(?=[\w:,]*}) Positive lookahead, assert optional repetitions of the allowed chars to the right and }

const str = "k1:v1abc{k2:v2,k3:v3}{test}";
const regex = /(?<={[\w:,]*)\w :\w (?=[\w:,]*})/g;
console.log(str.match(regex));

Another way could be using 2 passes, first matching the format and get the part between the curly braces in a capture group.

If there is a match, split group 1 on a comma.

{(\w :\w (?:,\w :\w )*)}

The pattern matches:

{ Match opening {
( Capture group 1
- \w :\w Match 1 word chars : and 1 word chars
- (?:,\w :\w )* Optionally repeat a , and the same previous pattern
)
} Match closing }

const str = "k1:v1abc{k2:v2,k3:v3}{test}";
const regex = /{(\w :\w (?:,\w :\w )*)}/;
const m = str.match(regex);
if (m) console.log(m[1].split(","));