How can I make a field validation in python, just for numbers and dashes? (0-9 and "-")-CodePudding

I am reading a csv a file and I need to check if one of the fields has the correct content. It needs to be compound by numbers (0-9) and possible "-". For example:
"12345" Corrrect
"12345-1" Corrrect
"12345a" Incorrrect

I tried using int(), but it only works for numbers, Dashes are acceptable as well.

Thank you for all your help.

CodePudding user response：

You can use str.isnumeric combined with str.replace to strip the dashes before validation:

s = "12345-1"
is_valid = s.replace('-', '').isnumeric()  # True

CodePudding user response：

Logic taken from this answer which applies more generally. To test a string run this, which can be adapted to work for the whole csv.

import re
word = '12345a'
special_char = False
regexp = re.compile('[^0-9-]')
if regexp.search(word):
    special_char = True