CODEWITHSUNDEEP
javascriptarraysreplace
88willr
88willr

Reputation: 148

Replace words found in string

Im trying to replace words in string with matched key and index position without removing the other words.

My desired output is: hey HI hey HELLO

What i've tried so far... 

var data = {
  items: ["item", "HI", "item2"],
  moreitems: ["moreitem", "moreitem1", "HELLO"]
}
var str = "hey #items1 hey #moreitems2";

var newStr = '';
var match = str.match(/#(.*?)\d+/g); //get str that starts with # and ends with digits
for (var i = 0; i < match.length; i++) {
  var keys = match[i].replace(/#|\d+/g, ''), // remove hash and numbers to match the data keys
    pos = match[i].replace(/\D/g, ''); // get the digits in str 
 newStr += data[keys][pos] + ' ';
}
console.log(newStr)

thanks for your help!

Upvotes: 0

Views: 82

Answers (3)

3limin4t0r
3limin4t0r

Reputation: 21130

A simple solution would be to use replace() with a replacer function.

I use the regex /#(\D+)(\d+)/g. Matching #, followed by one or more non-digits (placed in capture group 1), followed by one or more digits (placed in capture group 2).

regex diagram
Regexper

All capture groups are passed as arguments of the replacer function. The full match is passed as the first argument, capture group 1 as the second, etc.

Within the replacer function you can then access the value based on the captured attribute name and index.

var data = {
  items: ["item", "HI", "item2"],
  moreitems: ["moreitem", "moreitem1", "HELLO"]
}
var str = "hey #items1 hey #moreitems2";

const result = str.replace(
  /#(\D+)(\d+)/g,
  (_match, attr, index) => data[attr][index]
);
console.log(result);

Upvotes: 2

Mossaab
Mossaab

Reputation: 66

const dic       = {
  xxx: 'hello',
  yyy: 'world',
  zzz: 'peace'
}
const string    = 'hey! #xxx, #yyy! #zzz on you'
const newString = string.replace(/#\w+/g, item => dic[item.substring(1)])

console.log(string)
console.log(newString)

Upvotes: 1

jeremy-denis
jeremy-denis

Reputation: 6878

you can use

  • string.replace to replace the substr in the end of the process
  • calculate the index in string array by recovered the last character of match string with match[match.length - 1]
  • recover category of data to use by removing first and last character category = match.slice(0, -1).substring(1);

var data = {
  items: ["item", "HI", "item2"],
  moreitems: ["moreitem", "moreitem1", "HELLO"]
}

var str = "hey #items1 hey #moreitems2";

var newStr = str;
var match = str.match(/#(.*?)\d+/g);
var index, category;
console.log(match);

match.forEach(match => {
  index = match[match.length - 1];
  category = match.slice(0, -1).substring(1);
  newStr = newStr.replace(match, data[category][index]);
});

console.log(newStr)

Upvotes: 1

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