RegexField has the following optional arguments:
- regex: — A regex specified as a string or compiled regex object expressions.
- max_length and min_length : — if provided, these arguments ensure that the string is not greater than or equal to the given length.
- strip: — if True (default), the value will be stripped from leading and trailing spaces.
Syntax
field_name = forms.RegexField ( ** options )
Django form RegexField Explanation
RegexField illustration using example. Consider a project named pythonengineering that has an application named geeks .
Refer to the following articles to check how to create a project and an app in Django.
Enter the following code into the forms.py file of the geeks application.
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Add the geek app to INSTALLED_APPS
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Now, to convert this form to a view, we need a view and The URL associated with this URL. Let’s first create a view in the views.py of the geeks app,
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Here we import this particular form from forms.py and instantiate it in the view so that it could be displayed in the template.
Now, to initiate your Django form, you need to create a home.html where you can create things as you see fit. Let’s create a form in home.html .
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Finally, the URL to map to this view in urls.py
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Let’s start the server and check what’s on actually happened, Run
Python manage.py runserver
So the geeks_field RegexField is created by replacing "_" with ".
How to use RegexField?
RegexField is used to inject small selected text into the database. You can enter a specific entity name, email address, etc. So far, we’ve discussed how to implement a RegexField, but how to use it in a view to execute the boolean part. To do some logic, we need to get the value entered in the field into a Python string instance.
In views.py,
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Now let’s try to enter something else in the field.
Since it needs to be checked in soo Matching the supplied regular expression, the input must start with "G" and end with "s". Let’s enter "GeeksForGeeks" in the field
This data can now be retrieved using the appropriate query dictionary. If the method is GET, the data will be available in request.GET, and if post, then request.POST , respectively. In the above example, we have a value in temp that we can use for any purpose.
Basic Field Arguments
Basic Field Arguments — they are arguments given to each field to apply some kind of constraint or to convey a particular characteristic to a particular field. For example, adding the required = False argument to the RegexField will allow the user to leave it blank. Each Field constructor takes at least these arguments. Some Field classes accept additional field-specific arguments, but you should always accept the following:
| Field Options | Description |
|---|---|
| required | By default, each Field class assumes the value is required, so to make it not required you need to set required=False |
| label | The label argument lets you specify the “ human-friendly ”label for this field. This is used when the Field is displayed in a Form. |
| label_suffix | The label_suffix argument lets you override the form’s label_suffix on a per-field basis. |
| widget | The widget argument lets you specify a Widget class to use when rendering this Field. See Widgets for more information. |
| help_text | The help_text argument lets you specify descriptive text for this Field. If you provide help_text, it will be displayed next to the Field when the Field is rendered by one of the convenience Form methods. |
| error_messages | The error_messages argument lets you override the default messages that the field will raise. Pass in a dictionary with keys matching the error messages you want to override. |
| validators | The validators argument lets you provide a list of validation functions for this field. |
| localize | The localize argument enables the localization of form data input, as well as the rendered output. |
| disabled | The disabled boolean argument, when set to True, disables a form field using the disabled HTML attribute so that it won’t be editable by users. |
