PyInquirerTry/text_question_validator.py

from PyInquirer import prompt, Validator, ValidationError
from prompt_toolkit import document
import regex

class NickNameValidator(Validator):
	def validate(self, document: document.Document) -> None:
		ok = regex.match('^[A-Z][a-z]+$', document.text)
		if not ok:
			raise ValidationError(message = 'Please enter a correct name, with a uppercase and letters', cursor_position = len(document.text))

widget = [
	{
		'type':'input',
		'name':'nickname',
		'message':'Choose a nickname :',
		'validate':NickNameValidator
	}
]

try :
	result = prompt(widget)
except ValueError :
	print('Pb !!!')
	exit()

print('Your answer is')
print(result["nickname"])
print(type(result["nickname"]))