Go (RE2)

JSON Key-Value Pair (Simple) in GO

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

Try it in the GO tester →

Pattern

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

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.

How the pattern 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!

Examples

Input

{"name": "alice", "age": 30, "active": true}

Matches

  • "name": "alice"
  • "age": 30
  • "active": true

Input

"timeout": 5000, "retries": null

Matches

  • "timeout": 5000
  • "retries": null

Input

no json here

No match

—

Same pattern, other engines

JavaScript / ECMAScript

Supported

See how this pattern looks (and behaves) in JavaScript's built-in RegExp.

Python (re)

Supported

See how this pattern looks (and behaves) in Python's stdlib `re` module.

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