regex to extract json string from text

Question

I'm looking for regex to extract json string from text. I have the text below, which contains. My json:

[
  {
    "message": "(.*)",
    "answer": " :с"
  },
  {
    "message": "http:\/\/(.*)\.(.*)\/[\S\s]+\ ?",
    "answer": "No!"
  }
]

And php parse:

json_decode($json); //null
var_dump(json_last_error() == JSON_ERROR_SYNTAX); //true

Just to make sure: PHP has some beautifully crafted JSON functions build in already - trying to do everything with regular expressions shows a lack of phantasy :-) — Jan
– Jan, Commented Feb 1, 2016 at 19:56

rkosegi · Accepted Answer · 2019-10-03 07:42:28Z

1

If you call json_last_error_msg() you'll get the following:

invalid string sequence

Indeed, the string "http:\/\/(.*)\.(.*)\/[\S\s]+\ ?" is not a valid JSON string per the spec:

_{(source: json.org)}

Your string contains invalid escapes, such as \S, \., \s and \ (space).

Instead, try to escape each backslash:

$str = <<<'END'
[
  {
    "message": "(.*)",
    "answer": " :с"
  },
  {
    "message": "http:\\/\\/(.*)\\.(.*)\\/[\\S\\s]+\\ ?",
    "answer": "No!"
  }
]
END;

$json = json_decode($str);
var_dump($json);

This works.

edited Oct 3, 2019 at 7:42

rkosegi

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answered Feb 1, 2016 at 20:05

Lucas Trzesniewski

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