JOI how to allow empty spaces and punctuation

Question

I want to allow Joi to allow spaces/whitespaces in a title field of a form.

Working tomorrow with Jude.

should be allowed as wel as

Morningwalk

At this moment only the last one is validated as true. Here is my joi validation:

 const schema = Joi.object().keys({ title: Joi.string().alphanum().required().max(50),

I added Regex but without result.

 title: Joi.string().alphanum().required().max(50), regex( new RegExp('^\\w+( +\\w+)*$'))

What is the right way?

Answer 1

The .alphanum() makes your check ignore whitespace. Also, when you define a regex using a constructor notation, you are using a string literal where backslashes are used to form string escape sequences and thus need doubling to form regex escape sequences. However, a regex literal notation is more convenient. Rather than writing new RegExp('\\\\d') you'd write /\\d/ .

So, you may use this to allow just whitespaces:

title: Joi.string().required().max(50), regex(/^\w+(?:\s+\w+)*$/)

However, you seem to want to not allow commas and allow all other punctuation.

Use

title: Joi.string().required().max(50), regex(/^\s*\w+(?:[^\w,]+\w+)*[^,\w]*$/)

Details

• ^ - start of string
• \\s* - 0 or more whitespaces (or, use [^,\\w]* to match 0 or more chars other than comma and word chars)
• \\w+ - 1 or more word chars (letters, digits or _ , if you do not want _ , replace with [^\\W_] )
• (?:[^\\w,]+\\w+)* - zero or more repetitions of
  • [^\\w,]+ - 1 or more chars other than comma and word chars
  • \\w+ - 1 or more word chars
• [^,\\w]* - 0 or more chars other than comma and word chars
• $ - end of string.