How to convert Persian and Arabic digits of a string to English using JavaScript?

Question

How can I convert Persian/Arabic numbers to English numbers with a simple function?

arabicNumbers = ["١", "٢", "٣", "٤", "٥", "٦", "٧", "٨", "٩", "٠"] persianNumbers = ["۱", "۲", "۳", "۴", "۵", "۶", "۷", "۸", "۹", "۰"] 

It is the same schema, but the code pages are different.

Answer 1

Use this simple function to convert your string

var persianNumbers = [/۰/g, /۱/g, /۲/g, /۳/g, /۴/g, /۵/g, /۶/g, /۷/g, /۸/g, /۹/g], arabicNumbers  = [/٠/g, /١/g, /٢/g, /٣/g, /٤/g, /٥/g, /٦/g, /٧/g, /٨/g, /٩/g], fixNumbers = function (str) {   if(typeof str === 'string')   {     for(var i=0; i<10; i++)     {       str = str.replace(persianNumbers[i], i).replace(arabicNumbers[i], i);     }   }   return str; }; 

Be careful, in this code the persian numbers codepage are different with the arabian numbers.

Example

var mystr = 'Sample text ۱۱۱۵۱ and ٢٨٢٢'; mystr = fixNumbers(mystr); 

Refrence

Answer 2

Oneliner of all 6 possible translations between English, Arabic, and persian Digits.

const e2p = s => s.replace(/\d/g, d => '۰۱۲۳۴۵۶۷۸۹'[d]) const e2a = s => s.replace(/\d/g, d => '٠١٢٣٤٥٦٧٨٩'[d])  const p2e = s => s.replace(/[۰-۹]/g, d => '۰۱۲۳۴۵۶۷۸۹'.indexOf(d)) const a2e = s => s.replace(/[٠-٩]/g, d => '٠١٢٣٤٥٦٧٨٩'.indexOf(d))  const p2a = s => s.replace(/[۰-۹]/g, d => '٠١٢٣٤٥٦٧٨٩'['۰۱۲۳۴۵۶۷۸۹'.indexOf(d)]) const a2p = s => s.replace(/[٠-٩]/g, d => '۰۱۲۳۴۵۶۷۸۹'['٠١٢٣٤٥٦٧٨٩'.indexOf(d)])  e2p("asdf1234") // asdf۱۲۳۴ e2a("asdf1234") // asdf١٢٣٤ p2e("asdf۱۲۳۴") // asdf1234 a2e("asdf١٢٣٤") // asdf1234 p2a("asdf۱۲۳۴") // asdf١٢٣٤ a2p("asdf١٢٣٤") // asdf۱۲۳۴ 

Explaination:

• (s => f(s))(x) is a lambda function that is immediately executed, and will be equal to f(x)
• s.replace(pattern, function) looks for matches of pattern in s, for every match m it will replace m with function(m) in the string.
• /\d/g is a regex pattern, \d means a digit in the English language, g means global. If you don't specify the g it will only match the first occurrence, otherwise it will match all the occurrences.
• In this case for every English digit d in the string, that digit will be replaced by '۰۱۲۳۴۵۶۷۸۹'[d] so, 3 will be replaced by the third index in that list('۰۱۲۳۴۵۶۷۸۹') which is '۳'
• /[۰-۹]/g is the equivalent regex for Persian digits this time we can't use the same method, before we took advantage of the fact that javascript is dynamically typed and that d is automatically converted from a string(regex match) to a number(array index) (you can do '1234'['1'] in javascript which is the same as '1234'[1])
• but this time we can't do that because '1234'['۱'] is invalid. so we use a trick here and use indexOf which is a function that tells us the index of an element in an array(here a character in a string) so, '۰۱۲۳۴۵۶۷۸۹'.indexOf(۳) will give us 3 because '۳' is the third index in the string '۰۱۲۳۴۵۶۷۸۹'