Class IsPlainText

source code

                 object --+        
                          |        
basevalidator.BaseValidator --+    
                              |    
                   IsRegexMatch --+
                                  |
                                 IsPlainText

Check the value only contains alphanumerics, underscores & hyphen.

Useful for checking identifiers.

For example:

>>> v = IsPlainText()
>>> v ('abcd')
'abcd'
>>> v ('ab cd')
Traceback (most recent call last):
...
ValueError: 'ab cd' is not plain text
>>> v ('ab!cd')
Traceback (most recent call last):
...
ValueError: 'ab!cd' is not plain text

Idea flinched from FormEncode.