python regex match not working

Question

It might be a silly question but i can not get it working.

import re
def name_validator(value):
    reg = re.compile(r'^\D*&')
    if not reg.match(value):
        raise ValueError

I want to match any string that do not contains digits. But it always raise ValueError.

>>> import re
def name_validator(value):
    reg = re.compile(r'^\D*&')
    if not reg.match(value):
        raise ValueError
>>> name_validator('test')
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "<input>", line 5, in name_validator
ValueError

It's worth using something like regex101.com/#python to help you catch these mistakes early. — jonrsharpe
– jonrsharpe, Commented Mar 7, 2016 at 12:05

Wiktor Stribiżew · Accepted Answer · 2016-03-07 12:20:35Z

2

I want to match any string that does not contains digits.

The \D matches a non-digit symbol. A ^\D*$ matches an empty string and any string without digits inside.

You need to use

reg = re.compile(r'\D*$') # Note  DOLLAR symbol at the end
if not reg.match(value):

Or

reg = re.compile(r'^\D*$') # Note the CARET symbol at the start and the DOLLAR symbol at the end
if not reg.search(value):

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