The vast majority of attributes are Strings that's why the Ubidots API provides some powerful filters for Strings.

Field Type: Text Filters Available: exact (=) (case sensitive), iexact (case insensitive), contains, icontains (case insensitive), startswith, istartswith (case sensitive), endswith, iendswith (case insensitive), in (case sensitive), isnull

exact / iexact**

Filters for an exact match of of the String.

GET https://industrial.api.ubidots.com/api/v2.0/variables/?name=Productive%20Plants

//Returns Array 'results' with Variable name exactly matching "Productive Plants"
{
    "count": 1,
    "next": null,
    "previous": null,
    "results": [
        {
            "name": "Productive Plants",
 						...
        }
    ]
}
      
//Case Insensitive
GET https://industrial.api.ubidots.com/api/v2.0/variables/?name__iexact=Productive%20plants
{
    "count": 1,
    "next": null,
    "previous": null,
    "results": [
        {
            "name": "Productive Plants",
      			...
    ]
}

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Case Sensitivity
Please note that case insensitivity (A = a) can be used for filtering by simply adding the letter "i" in front of the following filters: exact, contains, startswith, endswith.

contains / icontains

Filters for a substring.

GET https://industrial.api.ubidots.com/api/v2.0/variables/?name__contains=plants

//Returns en empty 'results' Array because it's case sensitive
{
    "count": 0,
    "next": null,
    "previous": null,
    "results": []
}

GET https://industrial.api.ubidots.com/api/v2.0/variables/?name__icontains=plants

//Returns Array 'results' with matching Variables because of case INsensitivity
{
    "count": 2,
    "next": null,
    "previous": null,
    "results": [
        {
            "name": "Medium Plants",
            ...
        },
        {
            "name": "Productive Plants",
            ...
    ]
}

startswith / istartswith

Filters for strings starting with the provided string.

GET https://industrial.api.ubidots.com/api/v2.0/variables/?name__startswith=prod

//Returns empty Array because prod != Prod
{
    "count": 0,
    "next": null,
    "previous": null,
    "results": []
}

GET https://industrial.api.ubidots.com/api/v2.0/variables/?name__istartswith=prod

//Returns Array 'results' with matching Variable because of case INsensitivity (prod = Prod)
{
    "count": 1,
    "next": null,
    "previous": null,
    "results": [
        {
            "name": "Productive Plants",
            ...
        }
    ]
}

The same logic applies analogically to __endswith and __iendswith which filter for strings ending with a certain substring.

The __in has the same logic as described in the Id section.

The __isnull filter can be applied to a Text as described in the Boolean section.