Javascript: Remove trailing chars from string if they are non-numeric

Question

I am passing codes to an API. These codes are alphanumeric, like this one: M84.534D

I just found out that the API does not use the trailing letters. In other words, the API is expecting M84.534, no letter D at the end. The problem I am having is that the format is not the same for the codes. I may have M84.534DAC, or M84.534.

What I need to accomplish before sending the code is to remove any non-numeric characters from the end of the code, so in the examples:

M84.534D -> I need to pass M84.534

M84.534DAC -> I also need to pass M84.534

Is there any function or regex that will do that?

Thank you in advance to all.

There is a regex. $ denotes 'ends with', and combine with the digit operator maybe? /\d+$/ might be the right path — Sterling Archer
– Sterling Archer, Commented Dec 20, 2017 at 21:12

user184994 · Accepted Answer · 2017-12-20 21:18:46Z

4

You can use the regex below. It will remove anything from the end of the string that is not a number

let code = 'M84.534DAC'

console.log(code.replace(/[^0-9]+?$/, ""));

[^0-9] matches anything that is not a numer
+? Will match between 1 and unlimited times
$ Will match the end of the string

So linked together, it will match any non numbers at the end of the string, and replace them with nothing.

edited Dec 20, 2017 at 21:18

answered Dec 20, 2017 at 21:13

user184994

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3 Comments

user184994 Over a year ago

Updated with a description

Thiez Over a year ago

Works perfectly! As soon as it allows me, I mark it as Solved! I appreciate all the answers! Thank you @user184994 for the clear explanation.

Barmar Over a year ago

There's no need for the ? modifier since it's anchored at the end of the string.

Jan · Accepted Answer · 2017-12-20 21:15:43Z

2

You could use the following expression:

\D*$

As in:

var somestring = "M84.534D".replace(/\D*$/, '');
console.log(somestring);

Explanation: \D stands for not \d, the star * means zero or more times (greedily) and the $ anchors the expression to the end of the string.

answered Dec 20, 2017 at 21:15

Jan

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1 Comment

Thiez Over a year ago

Thank you very much for your time to answer and explain. I really appreciate it.

rafasoares · Accepted Answer · 2017-12-20 21:27:17Z

0

Given your limited data sample, this simple regular expression does the trick. You just replace the match with an empty string.

I've used document.write just so we can see the results. You use this whatever way you want.

var testData = [
  'M84.534D',
  'M84.534DAC'
]

regex = /\D+$/

testData.forEach((item) => {
   var cleanValue = item.replace(regex, '')
   document.write(cleanValue + '<br>')
})

RegEx breakdown: \D = Anything that's not a digit + = One or more occurrences $ = End of line/input

answered Dec 20, 2017 at 21:27

rafasoares

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