Remove "_100" or "_150" or "_num" alone from the end of string

Question

How would I remove _100 from the end of the string, It should be removed only at the end of the string. For e.g marks_old_100 should be "marks_old". marks_100 should be "marks".

function numInString(strs) {
  let newStr = ''
  for (let i = 0; i < strs.length; i++) {
    let noNumRegex = /\d/
    let isAlphRegex = /[a-zA-Z]$/
    if (isAlphRegex.test(strs[i])) {
      newStr += strs[i]
    }
  }
  return newStr
}

console.log(numInString('marks_100'))

Any efforts so far ? please post the code you have written ? — Code Maniac, Aug 24 '19 at 11:25
This does vary slightly from the duplicate in that this question asks about removing the underscore as well. — Jason Aller, Aug 24 '19 at 23:25

Geza Kerecsenyi · Answer 1 · 2019-08-24T11:40:41.850

0

Try:

string.replace(/_\d+$/g, "")

It makes use of regexes, and the $ matches the end of the string. .replace then replaces it with an empty string, returning the string without \d+ on the end. \d matches any digits, and + means to match more one or more.

Alternatively, if you want to match the end of a word, try:

string.replace(/_\d+\b/g, "")

which utilises \b, to match the end of a word.

edited Aug 24 '19 at 11:40

answered Aug 24 '19 at 11:26

Geza Kerecsenyi

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This works fine, but I also want to avoid _xxx or _xxxx from the string. – Alagu Selvan Aug 24 '19 at 11:35
@AlaguSelvan I'm not sure what you mean. Do you mean, you want to remove anything after the underscore? – Geza Kerecsenyi Aug 24 '19 at 11:36
@AlaguSelvan if so, try `string.replace(/_[a-zA-Z\d]{3,4}$/g, "")` – Geza Kerecsenyi Aug 24 '19 at 11:37
I want to remove all chars that the end that ends with "_number". – Alagu Selvan Aug 24 '19 at 11:38
@AlaguSelvan see now. – Geza Kerecsenyi Aug 24 '19 at 11:40
@ Geza Kerecsenyi It worked fine thanks. – Alagu Selvan Aug 24 '19 at 11:44

score 0 · Accepted Answer · answered Aug 24 '19 at 11:44

Please check the following snippet:

const s = 'marks_old_100';

// remove any number
console.log(s.replace(/_[0-9]+$/, ''));

// remove three digit number
console.log(s.replace(/_[0-9]{3}$/, ''));

// remove _100, _150, _num
console.log(s.replace(/_(100|150|num)$/, ''));

Remove "_100" or "_150" or "_num" alone from the end of string

2 Answers2