Javascript - issues with regex expression

Question

I have a string that should be validated to be in the form of something like "Readdata.v5". What I do in my code, is I split the string based on the . (I check to make sure there is exactly one . in the string, so all other cases are handled). I want to validate it so that the first part of the string follows the format of a phrase, followed by any character to the period. The second part should start with the char v and then be followed by any number. This is the regex I have so far:

console.log("first field validation: " + splitArray[0].match(/^\"(Create|Read|Update|Delete)[a-zA-Z]*.$/));
console.log("Second field validation: " + splitArray[1].match(/^.vd+\"$/));

However, it doesn't seem like my regex is working. Did I make a mistake? The values in the array are correct, and split the values correctly (the quotations are a part of the string).

can't you do it with single regex. i don't understand need of splitting — Code Maniac
– Code Maniac, Commented Dec 10, 2018 at 17:29
@CodeManiac I suppose, regex is something I'm not the best at. — user3334871
– user3334871, Commented Dec 10, 2018 at 17:30
@user3334871 you can do it with single regex itself. well if you some more example i can write one. — Code Maniac
– Code Maniac, Commented Dec 10, 2018 at 17:31
When you split the data, then . character shouldn't be included in your regex. — vrintle
– vrintle, Commented Dec 10, 2018 at 17:31

Code Maniac · Accepted Answer · 2018-12-10 17:44:22Z

2

You can use this

^"(Create|Read|Update|Delete)[a-zA-Z]*\.v\d+"$

Explanation

^ - Anchor to start of string.
(Create|Read|Update|Delete) - Will match Create or Read or Update or Delete.
[a-zA-Z]* - Will match any character zero or more time.
``.- will match.`.
v\d+ - Will match v followed by one or more digits.
$ - End of string.

Demo

edited Dec 10, 2018 at 17:44

answered Dec 10, 2018 at 17:34

Code Maniac

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4 Comments

vrintle Over a year ago

Shouldn't you include the quotes around "Readdata.v5"?

Code Maniac Over a year ago

@rv7 i thought those were used just to string.

user3334871 Over a year ago

Actually, the quotes are a part of the string :) . I just put ^\"(Create|Read|Update|Delete)[a-zA-Z]*\.v\d+\"$

Code Maniac Over a year ago

@user3334871 my bad i thought that was just representation of string.updated my answer.

Joaquin · Accepted Answer · 2018-12-10 17:35:05Z

2

If you want to validate that there is a "." in the chain, you can do this:

var stringToValidate = 'jon.foo';

if(!!stringToValidate.indexOf('.')){
 console.log('true')
}

the conditional is evaluated a true or false

answered Dec 10, 2018 at 17:35

Joaquin

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