Validate name to have no tabs or backslashes - Rails

Asked Dec 17 '19 at 10:11

Active Dec 17 '19 at 10:20

Viewed 31 times

I have the validation below for my model:

validates_format_of :name, :with => /\A[\t\\]+\z/, :message => :'errors.backslash_or_tab'

The regex is checking for tabs and backslashes. The issue is that even if the name does not contain a tab or backslash, it does not pass the validation and I get the error message popping up.

Some example scenarios:

testing123 - Fails (Expected to pass)
backslash\ - Fails (Expected to fail)
thisshouldwork - Fails (Expected to pass)

edited Dec 17 '19 at 10:20

asked Dec 17 '19 at 10:11

Daniel Lawton

It is matching only 1+ tabs or spaces. Can you add examples of the strings you are trying to validate to the question? – The fourth bird Dec 17 '19 at 10:14
3

You need `/\A[^\t\\]+\z/` that will match a string that does not contain tabs and backslashes – Wiktor Stribiżew Dec 17 '19 at 10:15
@Thefourthbird testing123 - Fails (Expected to pass) backslash\ - Fails (Expected to fail) thisshouldwork - Fails (Expected to pass) – Daniel Lawton Dec 17 '19 at 10:16
2

@DanielLawton Wiktor is right, you need to use a negated character class `[^` to match any char except a tab or backslash – The fourth bird Dec 17 '19 at 10:20
@WiktorStribiżew Thanks for the help guys! Forgot I was looking to negate the characters! – Daniel Lawton Dec 17 '19 at 10:25
I would write `str !~ /[\t\\]/`. – Cary Swoveland Dec 17 '19 at 19:45

Validate name to have no tabs or backslashes - Rails

0 Answers0