Validate input with regular expression for universal alphabets in javascript

Question

I have a form validator by AntonLapshin where I'm trying to validate a non-empty input field which can only take alphabets, space, - and '. The alphabets can be a-z, A-Z and europian letters æÆøØåÅöÖéÉèÈüÜ, etc. See this for more details.

Here is what I am doing:

method  : function(input) {
    return input.value !== ''
        && input.value === /^[a-zA-Z'\- \u00c0-\u017e]+$/
}

Here, it should match: Åløæ-Bond Mc'Cool

But fail: 123-Bond Mc'C@o!

When I run ^[a-zA-Z'\- \u00c0-\u017e]+$ in regex tester, It works absolutely fine, but in my script, it is not validating and throws an invalid input error.

What am I doing wrong?

There's no syntax error in my script. It's just the regex pattern not working. — CodeMonk
– CodeMonk, Commented Jul 3, 2018 at 5:44

Sheshank S. · Accepted Answer · 2018-07-03 05:45:11Z

2

I prefer to use RegExp. You also need to do return pattern.test(input)

This will work :)

var test1 = "Åløæ-Bond Mc'Cool";
var test2 = "123-Bond Mc'C@o!";

var pattern = new RegExp(/^[a-zA-Z'\- \u00c0-\u017e]+$/);

function regextest(input) {
    return input !== '' && pattern.test(input)
}

console.log(regextest(test1))
console.log(regextest(test2))

edited Jul 3, 2018 at 5:45

answered Jul 3, 2018 at 5:43

Sheshank S.

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2 Comments

Zim Over a year ago

Using RegExp is not necessary, but pattern.test is ;)

Sheshank S. Over a year ago

Really? @Zim Wow, I never realized that :) Learn something new every day ;) updated

Azad · Accepted Answer · 2018-07-03 09:23:08Z

1

modify your function to test with regex

var pattern = /^[a-zA-Z'\- \u00c0-\u017e]+$/

var method = function(input) {
  return input !== '' &&
    pattern.test(input)
}

//your sample strings
console.log(method("Åløæ-Bond Mc'Cool"))
console.log(method("123 - Bond Mc 'C@o!"))

edited Jul 3, 2018 at 9:23

answered Jul 3, 2018 at 5:32

Azad

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1 Comment

Sheshank S. Over a year ago

Don't know how there are 2 upvotes on this answer.. it doesn't work for me @CodeMonk

CodeMonk · Accepted Answer · 2018-07-05 10:38:54Z

0

I figured out a simpler solution for my question:

method  : function(input) {
    return input.value !== '' && /^[a-zA-Z'\- \u00c0-\u017e]+$/.test(input.value)
}

The problem was, after the && operator, I was checking for the input value (that’s wrong in regex check) instead of Boolean value.

This solution works perfectly and creates no confusion.

answered Jul 5, 2018 at 10:38

CodeMonk

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1 Comment

CodeMonk Over a year ago

You’re right. I’m only referring to the readability referring to my own question

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