Python (re)

JSON Key-Value Pair (Simple) in PY

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

Try it in the PY tester →

Pattern

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

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+.

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.

Go (RE2)

Supported

See how this pattern looks (and behaves) in Go's `regexp` package (RE2 engine).

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