I have this string:
var test = "toAdd";
I want to use it to extract data from JSON, like:
console.log(value.stats.test);
As you see, test is not correct, as it is just a string and can't be used, it is just not recognized at all. How do I make it recognize?
What you are attempting to do is this:
var someVar;
someVar.test = 'Sample';
someVar.test.attribute = 'Another sample';
// this:
console.log(someVar['test']['attribute']);
// will produce the same as this:
console.log(someVar['test'].attribute);
// as well as the same as this:
console.log(someVar.test['attribute']);
This will print "Another sample".
This has nothing to do with JSON. This is just javascript, and like anything where the . notation won't work switch to array notation:
foo.bar.baz = 'qux';
alert(foo['bar'].baz); // popup with 'qux'
^-----^-- note these
In your case, value.stats[test]. Now "test" isn't an array key, it's a variable whose value gets used as the key.
Related
I got a json through the spider, but the json format has a problem, name:value, the name is missing double quotes. like this:
{ listInfo:[{title:'it is title',url:'http://test.com',imgurl:'http://test.com',imgurl2:'',abstract:'',source:'',pubtime:'2019-05-22 11:47:24'},{title:'xx',url:'http://test.com/1.htm',imgurl:'http://test.com',imgurl2:'',abstract:'',source:'',pubtime:'2019-05-22 07:54:46'}]}
I want add double quotes in "name",and need to exclude String of [http { ...]
{ "listInfo":[{"title":'it is "title"',"url":'http://test.com',...
I tryed this but it is not work
#(.*?)\:(.*?)\n'
pattern = re.compile(r'^((?![http]\").)*\:(.*?)\n', re.MULTILINE )
content = content.replace(pattern.search(content).group(1),'\"'+pattern.search(content).group(1).strip()+'\"')
I also tryed
How to add double quotes to the dictionary?
content = '''
{ listInfo:[{title:'it is title',url:'http://test.com',
imgurl:'http://test.com',imgurl2:'',abstract:'',source:'',
pubtime:'2019-05-22 11:47:24'},{title:'xx',url:'http://test.com/1.htm',
imgurl:'http://test.com',imgurl2:'',abstract:'',source:'',pubtime:'2019-05-22 07:54:46'}]}
'''
# dict_str = lambda data : re.sub(r'(\w+):\s*(-?\d[\d/.]*)',r'"\1": "\2"',data)
dict_str = lambda data : re.sub(r'(\w+):(.*?)\n',r'"\1": "\2"',data)
for i in [content] :
var1=dict_str(i)
print(var1)
the result is look like:
{ "listInfo": "[{title:'it is title',url:'http://test.com',""imgurl": "'http://test.com',imgurl2:'',abstract:'',source:'',""pubtime": "'2019-05-22 11:47:24'},{title:'xx',url:'http://test.com/1.htm',""imgurl": "'http://test.com',imgurl2:'',abstract:'',source:'',pubtime:'2019-05-22 07:54:46'}]}"
Who knows how to write regEx.
Thinks!
I used a comparative method to solve it.
script = script.replace('abstract','\"abstract\"')
...
:(
I try to access to my data json file:
[{"id":1,"name":"Maria","project":[{"id":5,"name":"Animals"},{"id":6,"name":"Cats"}]}
This is my approach:
data[0].name;
But like this I get only the result:
Animals
But I would need the result:
Animals, Cats
You are accessing only the name property of 0th index of project array.
To access all object at a time you need to loop over the array.
You can use Array.map for this.
var data = [{"id":1,"name":"Maria","project":[{"id":5,"name":"Animals"},{"id":6,"name":"Cats"}]}]
var out = data[0].project.map(project => project.name).toString()
console.log(out)
If that's your actual data object, then data[0].name would give you "Maria". If I'm reading this right, though, you want to get all the names from the project array. You can use Array.map to do it fairly easily. Note the use of an ES6 arrow function to quickly and easily take in the object and return its name.
var bigObject = [{"id":1,"name":"Maria","project":[{"id":5,"name":"Animals"},{"id":6,"name":"Cats"}]}];
var smallObject = [{"id":5,"name":"Animals"},{"id":6,"name":"Cats"}];
console.log("Getting the names from the full array/data structure: "+bigObject[0].project.map(obj => obj.name))
console.log("Getting the names from just the project array: "+smallObject.map(obj => obj.name))
EDIT: As per your comment on the other answer, you said you needed to use the solution in this function:
"render": function (data, type, row) {if(Array.isArray(data)){return data.name;}}
To achieve this, it looks like you should use my bottom solution of the first snippet like so:
var data = [{"id":5,"name":"Animals"},{"id":6,"name":"Cats"}];
function render(data, type, row){
if(Array.isArray(data)){
return data.map(obj => obj.name);
}
};
console.log("Render returns \""+render(data)+"\" as an array.");
lets say there is customer object, i need to add new element address to this json object customer. how can I achieve this?
Both of these are not altering the customer JSON object
customer['address'] = addressObj
customer.address = addressObj
and I can not use push() as this is not adding a new item in list of objects.
Thanks,
Naren
Maybe your addressObj is not properly formed.
This works for me:
var customer = {"name": "Naren"};
customer.address1 = "stackoverflow";
customer.address2 = {"fulladdress":"stackoverflow"};
JSON.stringify(customer)
Output:
"{"name":"Naren","address1":"stackoverflow","address2":{"fulladdress":"stackoverflow"}}"
Maybe I am not clear on what exactly you want to do but it sounds to me as if you want have a JSON and want to merge it with another JSON, creating just a JSON file.
let Json1 = {'Superman': 'Favorite' };
let Json2 = {'Supergirl': 'Greatest'};
let Json3 = {'IronFist': 'Top 10' };
You now want to add Supergirl (the new element) to Superman (the old element) I assume. Take a look here # merge-json a simple package which does its job well. You would code as follows:
use strict;
var mergeJSON = require("merge-json");
let Json1 = {'Superman': 'Favorite' };
let Json2 = {'Supergirl': 'Greatest'};
let Json3 = {'IronFist': 'Top 10' };
let Json6 = mergeJSON(Json1,Json2);
Json6=mergeJSON(Json6,Json3);
You would end up with as follows:
Json6 = {'Superman': 'Favorite', 'Supergirl': 'Greatest', 'IronFist': 'Top 10'}
This is how I make use of combining JSON information or text information into a JSON file. You can get much more sophisticated with the module mentioned above. (Just do not confuse merge-json with json-merge and other modules.)
If this is not what you are looking for my apologies, then I did not understand the question correctly.
I'm trying to use a PCRE regular expression to extract some JSON. I'm using a version of MariaDB which does not have JSON functions but does have REGEX functions.
My string is:
{"device_types":["smartphone"],"isps":["a","B"],"network_types":[],"countries":[],"category":["Jebb","Bush"],"carriers":[],"exclude_carriers":[]}
I want to grab the contents of category. I'd like a matching group that contains 2 items, Jebb and Bush (or however many items are in the array).
I've tried this pattern but it only matches the first occurrence: /(?<=category":\[).([^"]*).*?(?=\])/g
Does this match your needs? It should match the category array regardless of its size.
"category":(\[.*?\])
regex101 example
JSON not a regular language. Since it allows arbitrary embedding of balanced delimiters, it must be at least context-free.
For example, consider an array of arrays of arrays:
[ [ [ 1, 2], [2, 3] ] , [ [ 3, 4], [ 4, 5] ] ]
Clearly you couldn't parse that with true regular expressions.
See This Topic:
Regex for parsing single key: values out of JSON in Javascript
Maybe Helpful for you.
Using a set of non-capturing group you can extract a predefined json array
regex answer: (?:\"category\":)(?:\[)(.*)(?:\"\])
That expression extract "category":["Jebb","Bush"], so access the first group
to extract the array, sample java code:
Pattern pattern = Pattern.compile("(?:\"category\":)(?:\\[)(.*)(?:\"\\])");
String body = "{\"device_types\":[\"smartphone\"],\"isps\":[\"a\",\"B\"],\"network_types\":[],\"countries\":[],\"category\":[\"Jebb\",\"Bush\"],\"carriers\":[],\"exclude_carriers\":[]}";
Matcher matcher = pattern.matcher(body);
assertThat(matcher.find(), is(true));
String[] categories = matcher.group(1).replaceAll("\"","").split(",");
assertThat(categories.length, is(2));
assertThat(categories[0], is("Jebb"));
assertThat(categories[1], is("Bush"));
There are many ways. One sloppy way to do it is /([A-Z])\w+/g
Please try it on your console like
var data = '{"device_types":["smartphone"],"isps":["a","B"],"network_types":[],"countries":[],"category":["Jebb","Bush"],"carriers":[],"exclude_carriers":[]}',
res = [];
data.match(/([A-Z])\w+/g); // ["Jebb", "Bush"]
OK the above was pretty sloppy however a solid single regex solution to extract every single element regardless of the number, one by one and to place them in an array (res) is the following...
var rex = /[",]+(\w*)(?=[",\w]*"],"carriers)/g,
str = '{"device_types":["smartphone"],"isps":["a","B"],"network_types":[],"countries":[],"category":["Jebb","Bush","Donald","Trump"],"carriers":[],"exclude_carriers":[]}',
arr = [],
res = [];
while ((arr = rex.exec(str)) !== null) {
res.push(arr[1]); // <- ["Jebb", "Bush", "Donald", "Trump"]
}
Check it out # http://regexr.com/3d4ee
OK lets do it. I have come up with a devilish idea. If JS had look-behinds this could have been done simply by reversing the applied logic in the previous example where i had used a look-forward. Alas, there aren't... So i decided to turn the world the other way around. Check this out.
String.prototype.reverse = function(){
return this.split("").reverse().join("");
};
var rex = /[",]+(\w*)(?=[",\w]*"\[:"yrogetac)/g,
str = '{"device_types":["smartphone"],"isps":["a","B"],"network_types":[],"countries":[],"category":["Jebb","Bush","Donald","Trump"],"carriers":[],"exclude_carriers":[]}',
rev = str.reverse();
arr = [],
res = [];
while ((arr = rex.exec(rev)) !== null) {
res.push(arr[1].reverse()); // <- ["Trump", "Donald", "Bush", "Jebb"]
}
res.reverse(); // <- ["Jebb", "Bush", "Donald", "Trump"]
Just use your console to confirm.
In c++ you can do it like this
bool foundmatch = false;
try {
std::regex re("\"([a-zA-Z]+)\"*.:*.\\[[^\\]\r\n]+\\]");
foundmatch = std::regex_search(subject, re);
} catch (std::regex_error& e) {
// Syntax error in the regular expression
}
If the number of items in the array is limited (and manageable), you could define it with a finite number of optional items. Like this one with a maximum of 5 items:
"category":\["([^"]*)"(?:,"([^"]*)"(?:,"([^"]*)"(?:,"([^"]*)"(?:,"([^"]*)")?)?)?)?
regex101 example here.
Regards.
I have a chunk of json that has the following format:
{"page":{"size":7,"number":1,"totalPages":1,"totalElements":7,"resultSetId":null,"duration":0},"content":[{"id":"787edc99-e94f-4132-b596-d04fc56596f9","name":"Verification","attributes":{"ruleExecutionClass":"VerificationRule"},"userTags":[],"links":[{"rel":"self","href":"/endpoint/787edc99-e94f-4132-b596-d04fc56596f9","id":"787edc99-e94f-...
Basically the size attribute (in this case) tells me that there are 7 parts to the content section. How do I convert this chunk of json to an array in Perl, and can I do it using the size attribute? Or is there a simpler way like just using decode_json()?
Here is what I have so far:
my $resources = get_that_json_chunk(); # function returns exactly the json you see, except all 7 resources in the content section
my #decoded_json = #$resources;
foreach my $resource (#decoded_json) {
I've also tried something like this:
my $deserialize = from_json( $resources );
my #decoded_json = (#{$deserialize});
I want to iterate over the array and handle the data. I've tried a few different ways because I read a little about array refs, but I keep getting "Not an ARRAY reference" errors and "Can't use string ("{"page":{"size":7,"number":1,"to"...) as an ARRAY ref while "strict refs" in use"
Thank you to Matt Jacob:
my $deserialized = decode_json($resources);
print "$_->{id}\n" for #{$deserialized->{content}};