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-rwxr-xr-xexamples/prompts/input-validation.py35
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diff --git a/examples/prompts/input-validation.py b/examples/prompts/input-validation.py
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+++ b/examples/prompts/input-validation.py
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+#!/usr/bin/env python
+"""
+Simple example of input validation.
+"""
+from prompt_toolkit import prompt
+from prompt_toolkit.validation import Validator
+
+
+def is_valid_email(text):
+ return "@" in text
+
+
+validator = Validator.from_callable(
+ is_valid_email,
+ error_message="Not a valid e-mail address (Does not contain an @).",
+ move_cursor_to_end=True,
+)
+
+
+def main():
+ # Validate when pressing ENTER.
+ text = prompt(
+ "Enter e-mail address: ", validator=validator, validate_while_typing=False
+ )
+ print("You said: %s" % text)
+
+ # While typing
+ text = prompt(
+ "Enter e-mail address: ", validator=validator, validate_while_typing=True
+ )
+ print("You said: %s" % text)
+
+
+if __name__ == "__main__":
+ main()