Text Processingflags: g

JSON Key-Value Pair (Simple)

Extract simple `"key": value` pairs from JSON-ish text (strings, numbers, booleans, null).

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("\"([^\"\\\\]+)\"\\s*:\\s*(\"[^\"\\\\]*\"|-?\\d+(?:\\.\\d+)?|true|false|null)", "g");
const input = "{\"name\": \"alice\", \"age\": 30, \"active\": true}";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

Python (re) code

pyPython

import re

pattern = re.compile(r"\"([^\"\\\\]+)\"\\s*:\\s*(\"[^\"\\\\]*\"|-?\\d+(?:\\.\\d+)?|true|false|null)")
input_text = "{\"name\": \"alice\", \"age\": 30, \"active\": true}"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

Go (RE2) code

goGo

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`"([^"\\]+)"\s*:\s*("[^"\\]*"|-?\d+(?:\.\d+)?|true|false|null)`)
	input := `{"name": "alice", "age": 30, "active": true}`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

Pattern

regexengine-agnostic

"([^"\\]+)"\s*:\s*("[^"\\]*"|-?\d+(?:\.\d+)?|true|false|null)   (flags: g)

Raw source: "([^"\\]+)"\s*:\s*("[^"\\]*"|-?\d+(?:\.\d+)?|true|false|null)

How it works

"([^"\\]+)" captures the key — non-quote, non-backslash chars (so escaped quotes break the match — by design, this is a quick parser, not a strict one). \s*:\s* matches the separator. The value group covers strings, signed integers/decimals, true, false, and null. Use a real JSON parser for production!