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Javascript – Limit more than one linebreak, limit double space, RegEx replace

I’m having trouble limiting a string to prevent multiple spaces and multiple linebreaks.
This reformat is gonna happen to an input value before uploading to server.

Ex:

Input:

    i am    a   text
with

little



to no


meaning    asdas

Expected output:

i am a text
with

little

to no

meaning asdas

I googled this but it only helps with linebreaks.

str.replace(/ns*n/g, 'nn')
Tags:

2

Answers


  1. 0

    First replace more than 2 newlines with exactly 2 newlines, then replace multiple spaces with a single space?

    var t = `
i am    a   text
with

little



to no


meaning    asdas
`.trim();
console.log(t.replace(/n{2,}/g, 'nn').replace(/[ ]{2,}/g, ' '));
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  2. 0

    Using s can also match a newline. Instead you can use a negated character class to match a whitespace character without a newline [^Sn]

    You could:

    • Trim the string

    • Match 2 or more newlines followed by whitespace chars without newlines using ^(?:n[^Sn]*){2,} and replace with a single newline

    • Match 2 or more whitespace chars without a newline [^Sn]{2,} and replace with a single space.

    const s = `    i am    a   text
with

little



to no


meaning    asdas`;
const result = s.trim()
  .replace(/^(?:n[^Sn]*){2,}/gm, "n")
  .replace(/[^Sn]{2,}/g, " ");

console.log(result);
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