Go (RE2)

JSON Boolean / Null Literal in GO

Match JSON `true`, `false`, and `null` literal values, with word boundaries to avoid partial matches.

Try it in the GO tester →

Pattern

regexGO
\b(true|false|null)\b   (flags: g)

Go (RE2) code

goGo
package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`\b(true|false|null)\b`)
	input := `{"active": true, "deleted": false, "deleted_at": null}`
	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

\b is a word boundary on both sides so we don't match inside `nullable` or `falsey`. (true|false|null) captures one of the three JSON literals. Useful for quick log scraping or schema-detection passes when full JSON parsing is overkill.

Examples

Input

{"active": true, "deleted": false, "deleted_at": null}

Matches

  • true
  • false
  • null

Input

active=true; expired=false

Matches

  • true
  • false

Input

no literals

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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