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Javascript – finding the first letters after the replaceAll() in j.s

hi how can we find and access the first letters that comes right after the replaceAll() ?
like we have : hi_my name is_reza => replaceAll("_"," ") => so now i want to access to (m) from my and to (r) from reza

id did try split() and indexOf() method but it just aiming one of underscores not all of them

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4

Answers


  1. Chosen as BEST ANSWER
    0

    thank you all . actually i was looking for a way to remove all underlines and replacing the first letter after them to be capital . so i used your solution to achieve that .

    const str = "hi_my name is_reza";
const d = str
  .split("_")
  .map((word, index) => {
    return index !== 0 ? word.charAt(0).toUpperCase() + word.slice(1) : word;
  })
  .join(" ")
  .replaceAll("_", " ");

console.log(d);


  2. 0

    You can use split, slice (start from index 1 to the end, because you don’t want the left part of the first ‘_’) and map (which execute over every element of an array) on hi_my name is_reza like so :

    const str = "hi_my name is_reza";
const d = str.split("_").slice(1).map(e =>e[0]);

console.log(d);
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  3. 0

    The get the first character(s) after _ underscore, you could use:

    const str = "hi_my name is_reza";
console.log(str.match(/(?<=_)./g))

    or with /(?<=_)[^_]/g

    Demo on Regex101.com

    To change that letter after _ (in order to capitalize it) and remove the underscore all in one go, you could use String.prototype.replace() like:

    const str = "hi_my name is_reza";
const output = str.replace(/_(.)/g, (m, m1) => ` ${m1.toUpperCase()}`)
console.log(output)
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  4. 0

    By this, you can do both replace and get those string after _

    let str = 'hi_my name is_reza';
let res = [];
const final = str.replaceAll(/_/g,function(r,index){
  res.push(str[index+1]);
  return ' '
});

console.log(final,res)// by this you can replace and get the string after _
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