CODEWITHSUNDEEP
pythondjangoregex
Shubham Singh Kalyanwat
Shubham Singh Kalyanwat

Reputation: 23

Regex to check validation in Django

I am trying to code for the following validation in Django: "Capital Letters are allowed only as of the first-word letter or only if all letters in a word are uppercase" I have done this till now, but it is failing, Can someone please help me?

For example:

This is The GOOD day - acceptable
ThIS is THE gOOD day - not acceptable

My code:

RegexValidator(
        regex='(^[A-Z][\sa-z0-9]+$)|(^([A-Z]\w*\s*)+$)',
        message='Capital Letters are allowed only as first word letter or only if all letters in word are uppercase',
        code='invalid_capitalisation'
)

Upvotes: 1

Views: 416

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626748

You may use

^(?!.*[a-z][A-Z])(?!.*[A-Z][a-z]+[A-Z]).*

See the regex demo

Details

  • ^ - start of string
  • (?!.*[a-z][A-Z]) - no lowercase letter followed with an uppercase one anywhere in the string is allowed
  • (?!.*[A-Z][a-z]+[A-Z]) - no uppercase letter followed with any 1 or more lowercase letters followed with an uppercase one anywhere in the string is allowed
  • .* - any 0 or more chars other than line break chars, as many as possible

Upvotes: 1

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