Unable to construct regular expression in JavaScript

Question

My requirement is something like this :

var actualstring = 'sales/salesorder/newOrder';

I'm writing a function which returns true if after sales/ , there is a string and a forward slash (/). It has to return false if after sales/ , there is just a string.

For example:

var actualstring = 'sales/salesorder/newOrder'; // should return true.  
var actualstring = 'sales/salesorder'; // should return false.  
var actualstring = 'sales/Invoice/InvoiceDetails'; // should return true.    
var actualstring = 'sales/Invoice/InvoiceDetails/View'; // should return true.   
var actualstring = 'sales/Invoice'; // should return false  

So for this I have some regular expression like this :

var term = 'sales/Invoice/InvoiceDetails/View';
var re = new RegExp("^(/sales/[a-z0-9]{5,}/[a-z0-9]{5,}{/})$");
if (re.test(term)) {
    console.log("Valid");
} else {
    console.log("Invalid");
}

This clearly seems to be not working and completely lost in all the symbols.

Answer 1

Sounds like you want to use

/^sales\/[a-zA-Z0-9]+\//

where ^ = start of string, followed by sales/ , followed by at least one alphanumeric character, up to any number of them, followed by a /

 var strings = ['sales/salesorder/newOrder', // should return true. 'sales/salesorder', // should return false. 'sales/Invoice/InvoiceDetails', // should return true. 'sales/Invoice/InvoiceDetails/View', // should return true. 'sales/Invoice']; // should return false console.log(strings.map(el => !!el.match(/^sales\\/[a-zA-Z0-9]+\\//)))

Answer 2

This should work for what you have described:

var term = 'sales/Invoice/InvoiceDetails/View';
var re = new RegExp("^(sales\/[a-zA-Z0-9]{5,}\/.*)$");
if (re.test(term)) {
  console.log("Valid");
} else {
  console.log("Invalid");
}

• Forward slack / needs to be escaped with a backslash. Like \\/
• Your test string also contains capital letters, so AZ needs to be checked too.
• There is a leading / in your your regEx but not in test string.

Answer 3

You can divide your regex into four groups

1. String should start with sales - (^sales)
2. Then there should be a forward slash - (\\/)
3. Then there should be a word - ([a-zA-Z0-9]+)
4. Then there should be a forward slash - (\\/)

So your complete regex will be

(^sales)(\\/)([a-zA-Z0-9]+)(\\/)

Here is sample code

 let samples = ['sales/salesorder/newOrder', 'sales/salesorder', 'sales/Invoice/InvoiceDetails', 'sales/Invoice/InvoiceDetails/View', 'sales/Invoice'] let regex = /(^sales)(\\/)([a-zA-Z0-9]+)(\\/)/ for(let sample of samples){ console.log(regex.test(sample)) }