Filter Comma and Whitespace in String using Regular Expression in JavaScript

Question

I want to filter a string using regular expression so that:

• multiple space is replaced with a single space
• all space before and after comma is replaced with single comma
• remove multiple comma with space
• remove staring and ending comma

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Sample Input:

" , This, is A ,,, Test , , to find regex,,in js 123 , "

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Expected Output:

"this,is a,test,to find regex,in js 123"

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What I have tried so far:

I have came up with a solution that is working so far.

var str = " , This, is A ,,, Test , , to find regex,,in js 123 , ";

str = str.replace(/ +/g, " "); //replace multiple space with single space
str = str.replace(/\s*,\s*/g, ","); //replace space before and after comma with single comma
str = str.replace(/,+/g, ","); //remove multiple comma with single comma
str = str.replace(/^,|,$/g, ""); //remove starting and ending comma

console.log(str);

Answer 1

First, remove all spaces next to commas:

replace(/ *, */g, ’,’)

Second, replace all consecutive commas with single commas and all consecutive spaces with single spaces:

replace(/,+/g, ‘,’)
replace(/ +/g, ‘ ‘)

Finally, remove leading and trailing commas:

replace(/^,/, ‘’)
replace(/,$/, ‘’)

var str = " , This, is A ,,, Test , , to find regex,,in js 123 , ";
str = str.replace(/^[\s,]+|[\s,]+$|\s*(\s|,)[\s,]*/g, "$1");
console.log(str);